lkml.org 
[lkml]   [2023]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [External] Re: [PATCH] tcp/udp: add tracepoint for send recv length
Cong Wang <xiyou.wangcong@gmail.com> 于2023年1月2日周一 03:10写道:
>
> On Thu, Dec 29, 2022 at 04:02:07PM +0800, Yunhui Cui wrote:
> > From: Xiongchun Duan <duanxiongchun@bytedance.com>
> >
> > Add a tracepoint for capturing TCP segments with
> > a send or receive length. This makes it easy to obtain
> > the packet sending and receiving information of each process
> > in the user mode, such as the netatop tool.
>
> You can obtain the same information with kretprobe:
> https://www.gcardone.net/2020-07-31-per-process-bandwidth-monitoring-on-Linux-with-bpftrace/

As we know, kprobe gets the result by trapping in an exception, which
loses performance compared to tracepoint.

We did a test for performance comparison. The results are as follows.

Time per request
sock_sendmsg(k,kr): 12.382ms, tcp_send_length(tracepoint): 11.887ms,
without hook:11.222ms

It can be seen that the performance loss of tracepoint is only half of
that of kprobe.

\
 
 \ /
  Last update: 2023-03-26 23:26    [W:0.072 / U:4.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site