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SubjectRe: [patch v4 0/3] aio: implement request batching [more performance numbers]
On Tue, Oct 06 2009, Jeff Moyer wrote:
> Here's a mail I got from Nathan Roberts.
>
> Cheers,
> Jeff
>
> ---
>
> Similar test as before. I had to re-upload the files so comparing
> against last time isn't really apples-apples.
>
> Disk is a cciss logical drive consisting of 12 SATA drives in a RAID6
> configuration with 128K stripes.
>
> Test case 1 is to read 1 million random 40K files (no file is read
> more than once), 16 4K iocbs at a time, 100 threads.
>
> Test case 2 is the same except 100,000 128K files are read.
>
> Unit of measure is "files read per second".
>
>
> 40K
> -------------------------------------------------
> Kernel NOOP
> ------ ----
> 2.6.30.5 682
> 2.6.30.5 (w/o drop_caches) 718
> 2.6.30.5+patch_v4 900
> 2.6.30.5+patch_v4 (w/o drop caches) 965
>
>
> 128K
> -------------------------------------------------
> Kernel NOOP
> ------ ----
> 2.6.30.5 242
> 2.6.30.5 (w/o drop_caches) 350
> 2.6.30.5+patch_v4 292
> 2.6.30.5+patch_v4 (w/o drop caches) 420

Nice numbers! The patch looks good to me from a quick look, if you want
I can throw it into the testing mix tomorrow and see what kind of
improvements I see here. With performance increase of that magnitude, we
should get it in sooner rather than later.

--
Jens Axboe



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