linux-kernel - Re: [PATCH v2 5/5] KVM: MMU: lower the aduit frequency

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Message-ID: <4C7E179D.6000405@redhat.com>
Date:	Wed, 01 Sep 2010 12:06:37 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] KVM: MMU: lower the aduit frequency

  On 08/31/2010 05:27 AM, Xiao Guangrong wrote:
>
>> I've always seen progress from the guest while running with audit
>> enabled (its slow, but its not supposed to be fast anyway).
>>
>> Did you experience a freeze?
>>
> There is a simply test in the guest if it's not rate limit:
>
> # time ls
> anaconda-ks.cfg  Documents  install.log         Music     Public     Videos
> Desktop          Downloads  install.log.syslog  Pictures  Templates
>
> real    1m26.053s
> user    0m0.311s
> sys     0m1.813s
>
> 'ls' command cost about 1.5 minute, if we run the memory test program, i think
> the time/delay is unacceptable...... :-(

Marcelo, would making the ratelimit optional help?  personally I think 
without ratelimit audit is useless, and with ratelimit it is a lot less 
useful but can still point out problems.  But I haven't used it in a while.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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