Re: Low latency sparc64 kernels ?
Premeptibility patching is broken on Sparc.
ReiserFS is broken on Sparc.
I do not know the details of why, I just know that this is the case.
Maybe it has changed but I very much doubt it. Hopefully a respected
authority like David Miller will be able to explain or confirm. XFS is
working on Sparc, though, at least for me and from what I hear from
others.
--- Aurelien Larcher <aurelien.larcher@egim-mrs.fr> wrote:
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> Hi,
>
> I'm experiencing a weird behaviour of the kernel and since I'm new
> to Linux I'm not able to understand what happend.
> I'm running Debian unstable on an Ultra 5 workstation.
> I've been using a 2.4.30 kernel until last week but because of the
> lack
> of responsiveness I decided to compile a low-latency patched kernel
> (Andrew Morton's) so as to benefit from a kinda 2.6-like preemption.
>
> I succeed in booting the custom 2.4.29 patched kernel I've compiled
> but a weird behaviour can be observed.
> Although the responsiveness seems to have been strongly increased
> (user interface), the system is rather slow.
> Especially when high loads occur.
>
> For instance, when I start OpenOffice: the CPU load used to be at the
> highest level (over 95%) with the former kernel and it took only
> several
> seconds (about 30 sec) to launch the app.
> Now it takes about 2 minutes and the CPU load is oscillating between
> 50% and 95% during the process.
> I googlized and found that there used to be problems when running a
> low latency kernel with reiserfs partitions (troughtput drop) but I
> can't
> find if it's currently still an issue.
>
> I would like to know if anybody has experienced the same "problem"
> and
> if there is a technical explanation (concerning the way the
> schedulding
> is handled ?) since the logs don't show anything unusual.
> Best regards
>
> Aurélien
>
> (Sorry for my *bad* english :( )
>
> - -
> -
>
----------------------------------------------------------------------------------------------------------------------------
> Aurélien Larcher - EGIM Promo2006
> Cephiem Junior Industrie: http://cephiem.egim-mrs.fr
> GInfo : http://ginfo.egim-mrs.fr
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>
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