linux-kernel - Re: [PATCH] increase ple

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Message-ID: <4D233039.8010509@intel.com>
Date:	Tue, 04 Jan 2011 22:35:37 +0800
From:	"Zhai, Edwin" <edwin.zhai@...el.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Rik van Riel <riel@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>
Subject: Re: [PATCH] increase ple_gap default to 64



Avi Kivity wrote:
> On 01/04/2011 04:18 PM, Rik van Riel wrote:
>   
>>
>> So should I resend the patch with the ple_gap default
>> changed to 128, or are you willing to ack the current
>> patch?
>>
>>     
>
> I think 128 is safer given than 41 was too low.  We have to take into 
> account newer cpus and slower spin loops.  If the spin loop does a cache 
> ping-pong (which would be a bad, bad possible, implementation), even 128 
> might be too low.
>   

Agree with Avi. Let us use 128 at this point.
Thanks,
edwin
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