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

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Message-ID: <20100901162743.GA12870@amt.cnet>
Date:	Wed, 1 Sep 2010 13:27:43 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.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 Wed, Sep 01, 2010 at 12:06:37PM +0300, Avi Kivity wrote:
>  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.

Was just wondering whether there was a freeze. Patchset looks good
(ratelimit can be disabled manually).

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