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DateWed, 25 Jul 2007 01:33:45 -0700 (PDT)
From david@lang ...
SubjectRe: -mm merge plans for 2.6.23
On Wed, 25 Jul 2007, david@lang.hm wrote:

> Subject: Re: -mm merge plans for 2.6.23
>
> On Wed, 25 Jul 2007, Rene Herman wrote:
>
>> On 07/25/2007 10:07 AM, david@lang.hm wrote:
>>
>> > On Wed, 25 Jul 2007, Rene Herman wrote:
>>
>> > > Something like this?
>>
>> [ ... ]
>>
>> > when the swap readahead is enabled does it make a significant
>> > difference
>> > in the time to do the random access?
>>
>> I don't use swap prefetch (nor -ck or -mm). If someone who has the patch
>> applied waits to hit enter until swap prefetch has prefetched it all back
>> in again, it certainly will.
>>
>> Swap prefetch's potential to do larger reads back from swapspace than a
>> random segfaulting app could well be very significant. Reads are dwarved
>> by seeks. If this program does what you wanted, please use it to show us.
>
> I haven't used swap prefetch either, the call was put out for what could be
> used to test the performance, and I was suggesting a test.
>
> if nobody else follows up on this I'll try to get some time to test it myself
> in a day or two.

this assumes that this isn't ruled an invalid test in the meantime.

in any case thanks for codeing this up so quickly.

David Lang
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