[lkml]   [2004]   [Aug]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [patch] voluntary-preempt-
Lee Revell wrote:
> On Mon, 2004-08-23 at 17:01, Ingo Molnar wrote:
>> - reduce netdev_max_backlog to 8 (Mark H Johnson)
> On my system this setting has absolutely no effect on the skb related
> latencies. I tested setting netdev_max_backlog to every power of two
> between 1 and 128, and regardless of this setting, I can produce a
> 450-600 usec latency with:
> ping -s 65507 -f $DEFAULT_GATEWAY
> Looks like skb_checksum is the problem. Here is one of the traces:
> Lee
> -

Setting netdev_max_backlog doesn't seem to have any effect for me either.

I get a similar latency when I try to reproduce your result above, ~612
usec. However, my trace is very different than yours:

In fact most any network activity, with the POSSIBLE exception of
already open connections, seem to be able to trigger higher latencies.
As you can see here:


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:05    [W:0.361 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site