From: Mark Tinguely <tinguely@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH] [RFC] xfs: lookaside cache for xfs_buf_find
Date: Tue, 24 Sep 2013 12:41:54 -0500 [thread overview]
Message-ID: <5241CEE2.5040607@sgi.com> (raw)
In-Reply-To: <20130924004803.GZ9901@dastard>
On 09/23/13 19:48, Dave Chinner wrote:
> On Mon, Sep 23, 2013 at 09:17:35AM -0500, Mark Tinguely wrote:
>> On 09/08/13 20:33, Dave Chinner wrote:
>>> From: Dave Chinner<dchinner@redhat.com>
>>>
>>> CPU overhead of buffer lookups dominate most metadata intensive
>>> workloads. The thing is, most such workloads are hitting a
>>> relatively small number of buffers repeatedly, and so caching
>>> recently hit buffers is a good idea.
>>>
>> ...
>>
>> I think this needs more testing.
>
> Yes, that's what an "RFC" implies. It's an idea, it's not
> fully baked and it's not ready for inclusion - it's a proof of
> concept that needs further work, and I't being posted for discussion
> to determine if it's worth pursuing further.
>
> Indeed, I haven't proposed it for inclusion yet because I'm
> still finding problems caused by the patch - it's still just a
> prototype at this point.
>
>> I got the same panic running xfstest 319 with the patch at:
>> http://oss.sgi.com/archives/xfs/2013-09/msg00578.html
>> once it hung on a xfs_buf lock before the panic.
>>
>> And these are the only tests that I threw at this patch.
>
> Sure. The version I have in my stack at the moment has some more
> ixes in it, like handling of length mismatches due to stale buffers
> on lookaside lookups, and other such things.
>
> i.e. early feedback on prototype code is exactly what [RFC] patches
> are for...
And early feedback is that it has potential but needs more work.
--Mark.
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
prev parent reply other threads:[~2013-09-24 17:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-09 1:33 [PATCH] [RFC] xfs: lookaside cache for xfs_buf_find Dave Chinner
2013-09-09 15:17 ` Mark Tinguely
2013-09-09 15:39 ` Dave Chinner
2013-09-18 21:48 ` Mark Tinguely
2013-09-18 23:24 ` Dave Chinner
2013-09-19 13:23 ` Mark Tinguely
2013-09-23 14:17 ` Mark Tinguely
2013-09-23 21:25 ` Michael L. Semon
2013-09-24 0:48 ` Dave Chinner
2013-09-24 17:41 ` Mark Tinguely [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5241CEE2.5040607@sgi.com \
--to=tinguely@sgi.com \
--cc=david@fromorbit.com \
--cc=xfs@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.