RE: [Xen-devel] Interrupt levels

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

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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