linux-kernel - Re: [PATCH v2 07/16] KVM: MMU: introduce for_each_pte_list

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Message-ID: <4F8E3C7F.5040601@linux.vnet.ibm.com>
Date:	Wed, 18 Apr 2012 12:01:03 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 07/16] KVM: MMU: introduce for_each_pte_list_spte

On 04/17/2012 10:47 PM, Takuya Yoshikawa wrote:

> On Mon, 16 Apr 2012 11:36:25 +0800
> Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> wrote:
> 
>> I tested it with kernbench, no regression is found.
> 
> Because kernbench is not at all good test for this.
> 
>> It is not a problem since the iter and spte should be in the cache.
> 
> I have checked dirty-log-perf myself with this patch [01-07].
> 
> GET_DIRTY_LOG for 1GB dirty pages has become more than 15% slower.
> 


Thanks for your test!

Unbelievable, i will do more test and check it more carefully.

Could you please open your tool, then i can reproduction it and find the
real reason?

> 
> Note: if you had checked the worst case latency with this patch series,
> you should have noticed this regression by yourself.
> 
> Auto-test and kernbench are not enough to see the effect of this work.
> 


I will check whether your tool is better then kernbench/autotest after
review your tool.

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