Take a look at https://github.com/iovisor/bcc/blob/master/docs/kernel-versions.md It shows the state of various drivers.  I don't have links handy, but some drivers offer driver based off-load, and

I think not now, because i asked the same question 2-3 months ago i answer was the same. -- Отправлено из мобильного приложения Яндекс.Почты

Hi all, I am wondering except for Netronome Cards if there are any other NICs that support XDP Offloading? Thank you in advance!

bcc now supports the maxactive kretprobe parameter [1], so if you want to test whether a higher maxactive value solves the issue you had, it's as easy as calling BPF.attach_kretprobe with a

map updates, but next xdp prog do not work, so i think i make something wrong or does not understand something 7:48, 21 февраля 2019 г., Jakub Kicinski <jakub.kicinski@...>: --

Try: bpftool map pin id $YOUR_ID /sys/fs/bpf/my_map and see if the prog array updates stick after that.

I loaded tail call prog with map via ip util, i do not know, if it pin map. But i can see it in list of maps via bpftool map with id 0:31, 21 февраля 2019 г., Jakub Kicinski

Hi All, Thanks for dialing in to the meeting today. Here are my notes from the discussion. Thanks, Brenden === Discussion === Alexei: - Discussion with some kernel devs regarding BPF memory model

Do you pin the tail call map? If tail call map is not kept open or pinned it will get flushed by the kernel (latest bpftool will print a warning about it). sockex3 keeps the fd open, that's why it

I created prog_map in my kern.o and call bpf_tail_call to it. Loaded with ip link set... Loaded another prog with bpftool. So tried to update map with bpftool woth id of my second progbut it does not

Please join us tomorrow for our bi-weekly call. As usual, this meeting is open to everybody and completely optional. You might be interested to join if: You want to know what is going on in BPF

Hi Brendan, During additional testing, find bug in my code, caused by padding for IPV6. If my previous changes will be useful for community, i can open PR in github?-- Best Regards, Seliavka Evgenii

So I upgraded my kernel version to 5.0.0-rc6, and it seems to consistently work perfectly now, even with a much higher density of futex calls than I was working with before. I'm still curious what the

Thanks Yonghong by the info, to summarize my findings: "BPF memory model is equal to memory model of underlying architecture", cit Alexei [1], then atomicity of those kind of operations can only be

> What's the source code of that kernel module? I adapted code from an example in a repository Spotify have, which is here:

<mauricio.vasquez@...> wrote: There are some memory model discussion in the netdev mailing list. I think this shows bpf memory model is really tied to underlying arch indeed. Some kinds of lock

What's the source code of that kernel module? Weird, I have the same problem you have for sys_futex if I adapt the script to track sys_write instead... I'm thinking it could be caused by a

Exactly. Please consider this example based on BCC https://gist.github.com/mauriciovasquezbernal/73ade7609eadcf23fb254401ed945cb3. In this case the counter member is naturally aligned, so in x86_64

Hi Brendan, Thank you for your response. Please find regenerated patch in attachment. Besides that i tried to minimize scope of the changes.-- Best Regards, Seliavka Evgenii

Hi Ashley, Could it be that you're reaching the maxactive bound and thus some probes are missed? From the kprobes documentation [1]: While the probed function is executing, its return address is