Re: New lockless pagecache

Alok kataria
2005-09-15T19:50:19Z

[-- Attachment #1: Type: text/plain, Size: 1672 bytes --]

Hi Nick,

I have collected performance numbers for the lock less page cache
patch on the AIM - IO test.
The performance numbers are collected for 1-100 tasks 1-50 tasks and
90-100 tasks both for with and without your patch. This was done on
2.6.13 kernel.
There's definite improvement when the tasks are small i.e ~50-70. But
when the tasks go beyond 80, we see a large performance dip.
I again profiled the 90-100 runs with spinlock's inlined, but couldn't
understand the reason behind the performance difference.

Please find attached the performance numbers as well as the oprofile logs.

Thanks & Regards,
Alok

On 9/2/05, Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> Nick Piggin wrote:
>
> > I think this is getting pretty stable. No guarantees of course,
> > but it would be great if anyone gave it a test.
> >
>
> Or review, I might add. While I understand such a review is
> still quite difficult, this code really is far less complex
> than the previous lockless pagecache patches.
>
> (Ignore 1/7 though, which is a rollup - a broken out patchset
> can be provided on request)
>
> Nick
>
> --
> SUSE Labs, Novell Inc.
>
> Send instant messages to your online friends http://au.messenger.yahoo.com
>
> -
> 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/
>

--
A computer scientist is someone who, when told to "Go to Hell," sees
the "go to," rather than the destination, as harmful.

Alok Kataria

[-- Attachment #2: lockless-pagecache.tjz --]
[-- Type: application/octet-stream, Size: 53665 bytes --]