Messages in this thread |  | | | Date | Wed, 25 Jul 2007 01:33:45 -0700 (PDT) | | From | david@lang ... | | Subject | Re: -mm merge plans for 2.6.23 |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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