Re: git pull on ia64 linux tree

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu_at_jp.fujitsu.com>
Date: 2006-03-27 11:16:56
On Sun, 26 Mar 2006 11:01:21 -0800
"Chen, Kenneth W" <kenneth.w.chen@intel.com> wrote:

> Luck, Tony wrote on Friday, March 24, 2006 3:02 PM
> Tony, please queue the following two patches in your next update.  They still
> apply cleanly on Linus' git-tree as of this morning.  Thanks.
>
> [patch] optimize flush_tlb_range on large numa box
> http://marc.theaimsgroup.com/?t=114168341600005&r=1&w=2
> 

I love this patch :) Our performance validation team found ia64_global_tlb_purge()
performance problem in do_wp_page()/ia64_global_tlb_purge(), copy-on-write.

When they does fork() at the rate of 4-500 fork/sec, 40% of cpu time was spent in 
copy-on-write's ia64_global_tlb_purge. By this, customer's shell-script cannot scale
enough. (we asked them to reduce fork()..)

(Because they have already removed their test enironment, I can't ask them to try
 this patch. sorry.)

Thanks,
--Kame
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Received on Mon Mar 27 11:15:52 2006

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