Re: [2.4 patch] fix CONFIG_X86_L1_CACHE_SHIFT
From: Manfred Spraul
Date: Mon Sep 08 2003 - 14:47:46 EST
Jeff Garzik wrote:
Yes; I've lost the specific context of the thread, but I have been
working on MWI/cacheline size issues along with IvanK for a while.
Context: Peter experiences very bad network performance with 2.4.22 - it
looks like 99% packet drop or something like that. The packet drop
disappears if CONFIG_L1_CACHE_SHIFT is set to 7 (i.e. 128 byte cache
line size). 2.4.21 works.
The network cards are some kind of atm cards. Several systems are
affected - at least Pentium II and PPro systems.
Peter: what's the exact brand and nic driver that you use? Could you try
to figure out what exactly breaks? I'd use "ping -f -s 1500", perhaps
together with "tcpdump -s 1500 -x" on both ends.
--
Manfred
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