Fedora 16 feels slow

Adam Williamson awilliam at redhat.com
Wed Sep 14 21:16:16 UTC 2011

On Wed, 2011-09-14 at 14:00 -0700, darrell pfeifer wrote:
> On Wed, Sep 14, 2011 at 13:28, Bruno Wolff III <bruno at wolff.to> wrote:
>         On Wed, Sep 14, 2011 at 13:46:40 -0700,
>          Adam Williamson <awilliam at redhat.com> wrote:
>         >
>         > They weren't; see my numbers in the related bug
>         > (https://bugzilla.redhat.com/show_bug.cgi?id=735268 ). The
>         debug
>         > overhead appears to have gotten much heavier in 3.1.
>         I added myself to that bug, though I wasn't really seeing that
>         much of
>         a slow down in graphics. (I have an rv280 which might not have
>         the issue
>         that later radeon cards were having.) My issue seems to be
>         related to
>         disk I/O. I am not sure if it is heavier cpu use in
>         journalling, raid or
>         encryption or if the actual I/O is slower. But it seems that
>         I/O heavy
>         activities such as yum updates and kernel builds are taking
>         several times
>         longer than they were a few weeks ago (in rawhide).

> I'm using the latest rawhide kernel. During times of heavy I/O the
> system becomes very unresponsive. The cursor will stop moving long
> enough to count to between 5 and 10. I know it happens with heavy
> network I/O so it might be the particular driver in my case. Not sure
> if the slow-down is true for other types of I/O. This has been true
> for all of the recent rawhide kernels.

The 'fix' for the F16 kernel is simply that, with the rc6 build,
debugging has been disabled. debugging is never disabled in Rawhide
kernels, so if debugging overhead is your problem, no Rawhide kernel is
going to cure it. To check if this is the case, just grab the latest F16
kernel - *not* the latest Rawhide kernel - and see if that improves
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | identi.ca: adamwfedora

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