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“offloading”

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Reply to DriverKit VLAN offload: IOUserNetworkPacket::getVlanTag() always returns false, kFeatureHardwareVlan undocumented
Cheers kevin, filed 2 bugs documentation: FB23530504 the header/doc inconsistency: kFeatureHardwareVlan is referenced in the getVlanTag()/setVlanTag() doc comments in IOUserNetworkPacket.iig but defined nowhere in the public SDK (exhaustive grep: 4 hits, all doc comments). suggestion: FB23562845, the enhancement request for a public hardware VLAN capability, with the usecase detail you asked for included. I also ran the experiment you suggested, declaring IF_HWASSIST_VLAN_TAGGING (0x00010000) via getFeatureFlags() on macOS 26.3.1, with live tagged traffic on a vlan(4) interface over the driver: Alongside kIOUserNetworkHWAssistSoftwareVlan: no behavioral change. getVlanTag() never returns true; tags remain inline in both directions. Alone: also ignored and the vlan(4) child clamps to MTU 1496, i.e. the unpublished bit doesn't even receive the VLAN-MTU accounting the published bit provides. It's discarded wholesale, not partially honoured. One refinement to I think you'll find that we strip the value: in our te
Topic: App & System Services SubTopic: Drivers Tags:
Jul ’26
App "no longer" in App Store - but it is!
After searching the forum, I couldn't find this problem so thought it worth flagging.I wanted to see the process in the new feature of offloading an app rather than deleting it. I offloaded several apps and they stayed on my device but with a small cloud with downward arrow symbol indicating it was able to be reinstalled. However, I hit problems when I attempted to reinstall the app, as I got a pop-up informing me that my device was unable to download the app as it was no longer available in the App Store. I even got that for YouTube, which I am pretty certain is still in the App Store.I got this error whether I tried to reinstall directly from the app icon on my device or via the iPhone Storage sub-menu in Settings. If I go direct to the App Store and search for the app, it's there and I can reinstall it. I'm using a 5s for this.
2
0
1k
Jun ’17
When to use the new FSExtentType.readOnly?
Is it necessary to switch to the new FSExtentType.readOnly when implementing kernel offloaded IO if my entire volume is read-only and marked as such via requestedMountOptions? (My assumption is no since I'd think all writes to the resource at that point should be prevented anyway, but wanted to ask just in case.)
1
0
175
Jun ’26
System data/other system data
I have an iPhone 12 Pro. I have 256GB of storage and 180.21GB is being taken by “system data”. I have offloaded apps, deleted files, cleared browser history, backed up, shut down etc and that number is still staying around the same. there have been a lot of posts about this without any answers. Has anyone found a resolution?
0
0
402
Dec ’21
Reply to VPN (Packet Tunnel Provider) over SMB
Thanks again @meaton for all the helpful replies!As I said I would do, I tried to reproduce it a lot of times, including uploading big files (3GB, 5GB) and it didn't reproduce on my Mac.However, at the customer, it reproduced easily, even with small files - she tries to upload 3 files of ~10mb each, and it happens.I checked again her Console logs, and no sign for utun_output or ctl_enqueuembuf, but those line seems related:default 17:27:22.110479 -0400 symptomsd NWPath: kNetworkPrimary NWPathStatusSatisfied interface en1 index 6 default 17:27:22.110535 -0400 symptomsd primary interface change to en1, type 1 default 17:27:22.110692 -0400 symptomsd Primary change default 17:27:22.110754 -0400 symptomsd noi: NOI: v:0 type:Wifi, isAny:yes, isBuiltin:no, loi:-1, flags:0, event: kNotificationNewPrimaryInterface, oldLoadedLqm: 100, rawLoadedLqm: 100, newLoadedLqm: 100, not posting default 17:27:22.118243 -0400 apsd Looking up connection on peer: d573aec0 found default 17:27:22.118320 -0400 apsd Looking up connection
Apr ’20
I’m crashing in codm
the new ios 14.8 update makes codm unplayable, it crashes mid game when im playing 20-30 minutes of game time my device is iphone 8, i tried everything you guys recommended, like reinstalling the app (also offloading the app), hard reset, turn on and off my phone, but all of these techniques i try is not working, i hope you guys can help me out.
1
0
575
Sep ’21
Low level API to take control of Neural Engine
Hi, I would love to code with the Neural Engine on my macbook pro M1 2020. Is there any low-level API to create my very own work-loads? I am working with audio and MIDI. As well sound synthesis and mixing. Can I use the Neural Engine to offload the CPU? I am especially interested in parallelism using threads. My programming lanuage of choice is ANSI C and Objective C.
4
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12k
Feb ’21
Shortcuts App Crashes on iOS 27 PB1
I'm having an issue with the Shortcuts app. All I get is a blank screen before it crashes. I have force-closed the app, hard-booted my iPhone, offloaded it, and deleted and reinstalled it. Still won't work. I really need to get it working. Any help is appreciated. iPhone 17 Pro Max iOS 27 Public Beta 1
1
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420
Jul ’26
Reply to Proposing Expressive Siri Offload via Private Cloud Compute (PCC) for 8GB Devices (Feedback ID: FB23178983)
Title / Comment Header: Diagnostic Update: Dedicated 6.21GB Apple Intelligence Partition Verified on 8GB Hardware Hi everyone, Providing an update with exact system storage telemetry from an 8GB RAM device on the latest developer beta: • Exact Path: Navigate to Settings > General > iPhone Storage > View All. • System Breakdown: The device explicitly itemizes Apple Intelligence at 6.21GB, situated immediately before the base iOS system image (approx. 16GB). • Dedicated Neural Allocation: This distinct partition confirms that the operating system has reserved and staged 6.21GB specifically for local foundation models, semantic weights, and Apple Neural Engine execution graphs—not general temporary cache. • Architectural Reality: This proves that 8GB hardware comfortably accommodates the full on-device Apple Intelligence foundation layer alongside a complete 16GB OS installation without storage constraints or partition failures. • The Continued Barrier: Despite a dedicated 6.21GB machine learning payloa
3w
What does this error log message mean?
When I'm debugging my VPN tunnel provider application on the iPhone device I found some error logs in the console: udp_validate_cksum_internal [C8.1:1] udp incorrect IPv4-UDP non-offload checksum 0xeaff ulen 1502 It only appears when I'm tuning the MTU to a bigger value for the NEPacketTunnelNetworkSettings. What does this message mean? Does it mean the inbound udp packet has a bad checksum and will it be dropped by iOS?
3
0
1.4k
Nov ’20
Using FSExtentType.zeroFill for allocated but uninitialized extents?
When implementing kernel offloaded IO, FSExtentType.zeroFill (https://developer.apple.com/documentation/fskit/fsextenttype/zerofill) indicates it should only be used for sparse files to represent ranges that haven’t been allocated yet. What if I have ranges that have been allocated disk space but not yet zeroed out, and have some kind of marker that indicates that those ranges aren’t initialized (and thus should be interpreted as zeroes)? Is it fine to use zeroFill to represent this case?
1
0
289
Jun ’26
Is DEXT Driver supporting these Networking Features?
I would like to know if macOS DEXT supports the following networking features: Tx/Rx Multiqueue, RSS, RSC, NS/ARP offload, PTP or packet timestamping and TSN. I couldn't find relevant documentation for these features in the Apple Developer Documentation. If they are supported, could you let me know which features are supported and how to find the corresponding official Apple documentation? Thanks
9
0
1.5k
Dec ’24
Reply to Localization in Xcode
Discussed this more with cross-functional teams and not using keys a no-go. This will not work if you want to share localization efforts across platforms beyond Apple which is more of a real-world scenario especially in enterprise settings. For example, Android requires localization keys to not have dots and other kinds of characters, also we found many 3rd party localization services had a character limit on key length. And when looking at very long localization entries, using the value as the key just doesn't make sense. I think sticking with my first intuition in using localization keys is the right way despite all the Apple sessions and samples showing otherwise. Also, just to share I was able to achieve isolating localization configurations by extending Text views to initialize from other Text views. This way, I can offload the localization configurations off the view by creating a bunch of static Text views and let the rest of the app pick them off the shelf. First I create the simple but awkwa
Jun ’21
Reply to DriverKit VLAN offload: IOUserNetworkPacket::getVlanTag() always returns false, kFeatureHardwareVlan undocumented
Cheers kevin, filed 2 bugs documentation: FB23530504 the header/doc inconsistency: kFeatureHardwareVlan is referenced in the getVlanTag()/setVlanTag() doc comments in IOUserNetworkPacket.iig but defined nowhere in the public SDK (exhaustive grep: 4 hits, all doc comments). suggestion: FB23562845, the enhancement request for a public hardware VLAN capability, with the usecase detail you asked for included. I also ran the experiment you suggested, declaring IF_HWASSIST_VLAN_TAGGING (0x00010000) via getFeatureFlags() on macOS 26.3.1, with live tagged traffic on a vlan(4) interface over the driver: Alongside kIOUserNetworkHWAssistSoftwareVlan: no behavioral change. getVlanTag() never returns true; tags remain inline in both directions. Alone: also ignored and the vlan(4) child clamps to MTU 1496, i.e. the unpublished bit doesn't even receive the VLAN-MTU accounting the published bit provides. It's discarded wholesale, not partially honoured. One refinement to I think you'll find that we strip the value: in our te
Topic: App & System Services SubTopic: Drivers Tags:
Replies
Boosts
Views
Activity
Jul ’26
App "no longer" in App Store - but it is!
After searching the forum, I couldn't find this problem so thought it worth flagging.I wanted to see the process in the new feature of offloading an app rather than deleting it. I offloaded several apps and they stayed on my device but with a small cloud with downward arrow symbol indicating it was able to be reinstalled. However, I hit problems when I attempted to reinstall the app, as I got a pop-up informing me that my device was unable to download the app as it was no longer available in the App Store. I even got that for YouTube, which I am pretty certain is still in the App Store.I got this error whether I tried to reinstall directly from the app icon on my device or via the iPhone Storage sub-menu in Settings. If I go direct to the App Store and search for the app, it's there and I can reinstall it. I'm using a 5s for this.
Replies
2
Boosts
0
Views
1k
Activity
Jun ’17
System Data is at 40 gb on iOS 18.0 for iPad
I have erased all contents once and had reclaimed space on the storage on the iPad. The system data has returned to over take my storage. Without erasing it again, is there a way to reclaim the space? I have turned on offload used apps and deleted all non essential apps on my Home Screen.
Replies
0
Boosts
0
Views
490
Activity
Jun ’24
When to use the new FSExtentType.readOnly?
Is it necessary to switch to the new FSExtentType.readOnly when implementing kernel offloaded IO if my entire volume is read-only and marked as such via requestedMountOptions? (My assumption is no since I'd think all writes to the resource at that point should be prevented anyway, but wanted to ask just in case.)
Replies
1
Boosts
0
Views
175
Activity
Jun ’26
System data/other system data
I have an iPhone 12 Pro. I have 256GB of storage and 180.21GB is being taken by “system data”. I have offloaded apps, deleted files, cleared browser history, backed up, shut down etc and that number is still staying around the same. there have been a lot of posts about this without any answers. Has anyone found a resolution?
Replies
0
Boosts
0
Views
402
Activity
Dec ’21
Reply to VPN (Packet Tunnel Provider) over SMB
Thanks again @meaton for all the helpful replies!As I said I would do, I tried to reproduce it a lot of times, including uploading big files (3GB, 5GB) and it didn't reproduce on my Mac.However, at the customer, it reproduced easily, even with small files - she tries to upload 3 files of ~10mb each, and it happens.I checked again her Console logs, and no sign for utun_output or ctl_enqueuembuf, but those line seems related:default 17:27:22.110479 -0400 symptomsd NWPath: kNetworkPrimary NWPathStatusSatisfied interface en1 index 6 default 17:27:22.110535 -0400 symptomsd primary interface change to en1, type 1 default 17:27:22.110692 -0400 symptomsd Primary change default 17:27:22.110754 -0400 symptomsd noi: NOI: v:0 type:Wifi, isAny:yes, isBuiltin:no, loi:-1, flags:0, event: kNotificationNewPrimaryInterface, oldLoadedLqm: 100, rawLoadedLqm: 100, newLoadedLqm: 100, not posting default 17:27:22.118243 -0400 apsd Looking up connection on peer: d573aec0 found default 17:27:22.118320 -0400 apsd Looking up connection
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Views
Activity
Apr ’20
Storage being taken by iOS 14 beta 2?
I just updated my iPhone SE 2020 64 GB to iOS 14 beta 2 and now I have no storage left. I have found that the category “Other” is taking about 26 gigabytes of space. I have 63.2 gigabytes of space taken up of my 64 and I have offloaded as many apps as I can. Anyone have any idea what could be causing this? Thanks!
Replies
0
Boosts
0
Views
502
Activity
Jul ’20
I’m crashing in codm
the new ios 14.8 update makes codm unplayable, it crashes mid game when im playing 20-30 minutes of game time my device is iphone 8, i tried everything you guys recommended, like reinstalling the app (also offloading the app), hard reset, turn on and off my phone, but all of these techniques i try is not working, i hope you guys can help me out.
Replies
1
Boosts
0
Views
575
Activity
Sep ’21
Low level API to take control of Neural Engine
Hi, I would love to code with the Neural Engine on my macbook pro M1 2020. Is there any low-level API to create my very own work-loads? I am working with audio and MIDI. As well sound synthesis and mixing. Can I use the Neural Engine to offload the CPU? I am especially interested in parallelism using threads. My programming lanuage of choice is ANSI C and Objective C.
Replies
4
Boosts
0
Views
12k
Activity
Feb ’21
Shortcuts App Crashes on iOS 27 PB1
I'm having an issue with the Shortcuts app. All I get is a blank screen before it crashes. I have force-closed the app, hard-booted my iPhone, offloaded it, and deleted and reinstalled it. Still won't work. I really need to get it working. Any help is appreciated. iPhone 17 Pro Max iOS 27 Public Beta 1
Replies
1
Boosts
0
Views
420
Activity
Jul ’26
Reply to Proposing Expressive Siri Offload via Private Cloud Compute (PCC) for 8GB Devices (Feedback ID: FB23178983)
Title / Comment Header: Diagnostic Update: Dedicated 6.21GB Apple Intelligence Partition Verified on 8GB Hardware Hi everyone, Providing an update with exact system storage telemetry from an 8GB RAM device on the latest developer beta: • Exact Path: Navigate to Settings > General > iPhone Storage > View All. • System Breakdown: The device explicitly itemizes Apple Intelligence at 6.21GB, situated immediately before the base iOS system image (approx. 16GB). • Dedicated Neural Allocation: This distinct partition confirms that the operating system has reserved and staged 6.21GB specifically for local foundation models, semantic weights, and Apple Neural Engine execution graphs—not general temporary cache. • Architectural Reality: This proves that 8GB hardware comfortably accommodates the full on-device Apple Intelligence foundation layer alongside a complete 16GB OS installation without storage constraints or partition failures. • The Continued Barrier: Despite a dedicated 6.21GB machine learning payloa
Replies
Boosts
Views
Activity
3w
What does this error log message mean?
When I'm debugging my VPN tunnel provider application on the iPhone device I found some error logs in the console: udp_validate_cksum_internal [C8.1:1] udp incorrect IPv4-UDP non-offload checksum 0xeaff ulen 1502 It only appears when I'm tuning the MTU to a bigger value for the NEPacketTunnelNetworkSettings. What does this message mean? Does it mean the inbound udp packet has a bad checksum and will it be dropped by iOS?
Replies
3
Boosts
0
Views
1.4k
Activity
Nov ’20
Using FSExtentType.zeroFill for allocated but uninitialized extents?
When implementing kernel offloaded IO, FSExtentType.zeroFill (https://developer.apple.com/documentation/fskit/fsextenttype/zerofill) indicates it should only be used for sparse files to represent ranges that haven’t been allocated yet. What if I have ranges that have been allocated disk space but not yet zeroed out, and have some kind of marker that indicates that those ranges aren’t initialized (and thus should be interpreted as zeroes)? Is it fine to use zeroFill to represent this case?
Replies
1
Boosts
0
Views
289
Activity
Jun ’26
Is DEXT Driver supporting these Networking Features?
I would like to know if macOS DEXT supports the following networking features: Tx/Rx Multiqueue, RSS, RSC, NS/ARP offload, PTP or packet timestamping and TSN. I couldn't find relevant documentation for these features in the Apple Developer Documentation. If they are supported, could you let me know which features are supported and how to find the corresponding official Apple documentation? Thanks
Replies
9
Boosts
0
Views
1.5k
Activity
Dec ’24
Reply to Localization in Xcode
Discussed this more with cross-functional teams and not using keys a no-go. This will not work if you want to share localization efforts across platforms beyond Apple which is more of a real-world scenario especially in enterprise settings. For example, Android requires localization keys to not have dots and other kinds of characters, also we found many 3rd party localization services had a character limit on key length. And when looking at very long localization entries, using the value as the key just doesn't make sense. I think sticking with my first intuition in using localization keys is the right way despite all the Apple sessions and samples showing otherwise. Also, just to share I was able to achieve isolating localization configurations by extending Text views to initialize from other Text views. This way, I can offload the localization configurations off the view by creating a bunch of static Text views and let the rest of the app pick them off the shelf. First I create the simple but awkwa
Replies
Boosts
Views
Activity
Jun ’21