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xen-devel
RE: [Xen-devel] Interrupt levels
I just tried booting the demo CD on a machine with an MPT Fusion card (a
sun V20z) and it worked fine.
Even doing a 'find . | xargs cat >/dev/null' I only got 10k interrupts a
second.
It'll be interesting to hear what it does on your machine.
Ian
> -----Original Message-----
> From: Nicholas Lee [mailto:nic-lists@xxxxxxxxxxxxxx]
> Sent: 09 March 2005 10:59
> To: Ian Pratt
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx; ian.pratt@xxxxxxxxxxxx
> Subject: Re: [Xen-devel] Interrupt levels
>
> On Wed, Mar 09, 2005 at 09:38:44AM -0000, Ian Pratt wrote:
> > Things do rather point at your fusion mpt scsi card driver. It's odd
> > that it's the timer interrupt that counts fast rather than the
> > associated device interrupt, but this could be because its always
> > setting an 'add_timer' to go off in the very near future.
>
> nic@stateless:/usr/src/xen/xen-2.0-testing.bk/linux-2.6.10-xen
0/drivers/message/fusion$ grep -rs add_time .
> ./mptbase.c: add_timer(&pCfg->timer);
> ./mptbase.c: add_timer(&pCfg->timer);
> ./mptctl.c:
> add_timer(&ioc->ioctl->timer);
> ./mptctl.c: add_timer(&ioctl->TMtimer);
> ./mptctl.c: add_timer(&ioc->ioctl->timer);
> ./mptscsih.c: * and add_timer
> ./mptscsih.c: add_timer(&hd->TMtimer);
> ./mptscsih.c: add_timer(&hd->timer);
> ./mptscsih.c: add_timer(&hd->timer);
>
>
> Which is likely to be the one to look at closer? Not being a kernel
> expert myself.
>
>
> What about XFS? Could that cause this issue?
>
>
> I'll see if I can get out there tomorrow afternoon and try the text
> based CD.
>
> Testing has the same problem:
>
> ERROR: cannot use unconfigured serial port COM1
> __ __ ____ ___
> \ \/ /___ _ __ |___ \ / _ \
> \ // _ \ '_ \ __) || | | |
> / \ __/ | | | / __/ | |_| |
> /_/\_\___|_| |_| |_____(_)___/
>
> http://www.cl.cam.ac.uk/netos/xen
> University of Cambridge Computer Laboratory
>
> Xen version 2.0 (nic@) (gcc version 3.3.5 (Debian
> 1:3.3.5-8)) Wed Mar 9 21:00:54 NZDT 2005
> Latest ChangeSet: 2005/03/09 02:02:39 1.1768
> 422e593fP_MDJ47j5LhtS8fQOVuyAQ
>
>
> nic@stateless:~$ vmstat 3
> procs -----------memory---------- ---swap-- -----io----
> --system-- ----cpu----
> r b swpd free buff cache si so bi bo in
> cs us sy id wa
> 0 0 0 215240 104 15328 0 0 179 36
> 150999 137 4 1 92 2
> 0 0 0 215240 104 15328 0 0 0 0
> 202363 11 0 0 100 0
> 0 0 0 215248 104 15328 0 0 0 239
> 205301 49 0 0 100 0
> 0 0 0 215248 104 15328 0 0 0 0
> 202289 8 0 0 100 0
> 0 0 0 215248 104 15328 0 0 0 6
> 202663 13 0 0 100 0
> 0 0 0 215248 104 15328 0 0 0 163
> 204469 44 0 0 100 0
> 0 0 0 215248 104 15328 0 0 0 0
> 205706 8 0 0 100 0
>
> This is again a clean state, with no xend only the processes from the
> previous 'ps awx' running.
>
>
> MPT is in the kernel, but not mptctl.
>
> Nicholas
>
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