Re: yum upgrade on btrfs very slow

Tomasz Torcz
2009-09-29T06:18:22Z

On Mon, Sep 28, 2009 at 09:35:43AM -0400, Chris Mason wrote:
> On Mon, Sep 28, 2009 at 02:18:27PM +0200, Tomasz Torcz wrote:
> >
> > Hi,
> >
> > I'm using btrfs as rootfs on my Fedora 12 (rawhide) test system.
> > Every yum activity is very slow, like 15 minutes for installation of 11
> > packages 25MB in size. Kernel is 2.6.31.1-48.fc12.x86_64, btrfs-progs-0.19-7.fc12.x86_64.
> > Hardware is pentium 4 3.0 GHz (Hyperthreading, 64 bit), with single IDE disk
> > on Intel ICH controller.
>
> You're doing quite a lot of reads, and some writes. Could you please
> capture the output of sysrq-w at 5s intervals during the upgrade?

It got quite big (over 100 KiB, over 1 MiB after unpacking), so I
put it at http://pipebreaker.pl/dump/sysrq-w_every_5_sec.txt.bz2

--
Tomasz Torcz Only gods can safely risk perfection,
xmpp: zdzichubg@chrome.pl it's a dangerous thing for a man. -- Alia