Subject: Re: 2.6.24 BUG: soft lockup - CPU#X

From: Jarek Poplawski <[email-masked]>
Date: Wed, 26 Mar 2008 22:46:48 +0100

On Wed, Mar 26, 2008 at 01:26:00PM -0700, Matheos Worku wrote:
...
> Reproduced the lockup with irqbalance disabled and with single src of  
> interrupt (TX interrupt, UDP transmit).  Lockup appears in different  
> location though.
>
> Regards
> matheos
>
> irq of interest: 454 (TX interrupt)
>
>
> 454:      19249      93234     907186       2691          0        188    
>       0        160   PCI-MSI-edge      eth6
...
> .......
>
> 454:      19249     126519     907186       2691          0        188    
>       0        160   PCI-MSI-edge      eth6

Hmm... Is this before disabling or I miss something?

Of course, my hint could be wrong here, but there are some issues
around napi vs. irq balancing, so it would be interesting to check
this with all network cards irqs affinity set (and respected).

This could be interesting:
http://marc.info/?l=linux-netdev&m=120349568512423&w=2
(but I suspect there are possible other reasons yet)

Jarek P.