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From: Jan Kiszka <jan.kiszka@domain.hid>
To: Ulrich Schwab <schwab@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-core] SMI update
Date: Thu, 10 Aug 2006 00:44:56 +0200	[thread overview]
Message-ID: <44DA6568.6050300@domain.hid> (raw)
In-Reply-To: <200608091837.55424.schwab@domain.hid>

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Ulrich Schwab wrote:
> I saw some bad latency behaviour on a new system, it is a
> P4 with ICH7 chipset. It showed  more than 300 us max. latency without any 
> load.
> This chipset was not detected as SMI generating and SMI disable was not done.
> 
> Finally I figured out where to add this DEVICE_ID
> to the SMI detection in smi.c
> It is done in the attached patch.
> 
> Now, the max. latency values on this new system are below 10 us.
> Although, not tested very long.

...and not under load. ;)

Thanks for the patch, we just need some additional define of
PCI_DEVICE_ID_INTEL_ICH7_0 for kernel 2.4 compatibility. And if you
additionally provide a ChangeLog fragment, your patch would be perfect!
(I tend to forget the last part often too... :) )

Jan


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  reply	other threads:[~2006-08-09 22:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-09 16:37 [Xenomai-core] SMI update Ulrich Schwab
2006-08-09 22:44 ` Jan Kiszka [this message]
2006-08-10  7:44   ` Ulrich Schwab
2006-08-10  8:27     ` Jan Kiszka
2006-08-10 12:54       ` Ulrich Schwab
2006-08-12 20:30         ` Gilles Chanteperdrix

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