Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 - netdev_max_back_log is too small

From: Ingo Molnar
Date: Wed Sep 01 2004 - 08:04:47 EST



* P.O. Gaillard <pierre-olivier.gaillard@xxxxxxxxxxxxxxxxxx> wrote:

> I know that you have reduced netdev_max_back_log to 8 to reduce the
> latency. But I think that you should know that I had to set it back to
> 32 to avoid ethernet frame losses on a 3GHz P4 using e1000
> (eth0/threaded=1).

could you try the -Q6 patch? That leaves netdev_max_backlog at the
default value of 300 and uses another method to break up the networking
codepaths, without any bad tradeoffs.

Ingo
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