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Re: [PATCH] VM cache policy change.

From: Thomas Schwinge
Subject: Re: [PATCH] VM cache policy change.
Date: Tue, 17 Jul 2012 00:53:56 +0200
User-agent: Notmuch/0.9-101-g81dad07 (http://notmuchmail.org) Emacs/23.3.1 (i486-pc-linux-gnu)


On Mon, 16 Jul 2012 22:44:33 +0200, Richard Braun <rbraun@sceen.net> wrote:
> On Mon, Jul 16, 2012 at 10:30:23PM +0200, Thomas Schwinge wrote:
> > I have logs for »ps -w 0 -AF hurd-long«, »vmstat«, »slabinfo« for all
> > runs, directly after booting, and some time after the glibc »make check«,
> > please tell me which you'd like to see; it's a lot of data already.
> Thanks for this report.

And, first and foremost, thanks to you for working on this topic!

One thing that comes to mind, by the way, is that the original Debian and
your patched package have been built in different environments, by
different compilers, so the comparison between them is not completely
unbiased, but probably (hopefully!) that shouldn't affect the results
very much.

> The results of vmstat and slabinfo (vm_object,
> thread and ipc_port lines) are what I'm mostly interested in. I suspect
> there are quite a lot of them, and the performance regression probably
> comes from the scalability issues previously described.

As you asked on IRC, I'm simply attaching a tarball containing all the
log files, also a few from an earlier 2:1.3.99.dfsg.git20120219-1 run
(with older hurd* and libc0.3* packages, too, and without netdde), in
case that might be interesting too.  Please ask if there is anything
unclear about which file is which.

Also I'm happy to run further tests -- I'll leave the system in the
current state.


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