linux-kernel - Re: [NFS] Kernel BUG

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Message-ID: <458C6E56.3070700@edsons.demon.nl>
Date:	Sat, 23 Dec 2006 00:46:30 +0100
From:	Rudy Zijlstra <rudy@...ons.demon.nl>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Trond Myklebust <Trond.Myklebust@...app.com>,
	nfs <nfs@...ts.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [NFS] Kernel BUG

Peter Zijlstra wrote:

>On Fri, 2006-12-22 at 12:59 +0100, Rudy Zijlstra wrote:
>  
>
>>Hi,
>>
>>I have a system where whenever i trigger a ongoing consistent NFS load i 
>>get the following kernel BUG:
>>
>>----------
>>kernel BUG at mm/truncate.c:311!
>>    
>>
>
>Lotsa changes there:
>try these:
> http://client.linux-nfs.org/Linux-2.6.x/2.6.19/linux-2.6.19-NFS_ALL.dif
>
>And:
>  http://lkml.org/lkml/2006/12/19/279
>
>  
>
Thanks, i have now a 2.6.19.1 patched with the above NFS_ALL patchset 
running under load since about 17:00 and still going strong. So seems to 
have solved the problem!

Also, performance seems to have significantly increased. I am testing 
this with MythTv with the storage over NFS. With HD LiveTV (which  is 
what i use to test this), this translates into about 43Mbps total load, 
from almost 15Mbps video stream which is present 3x on the ethernet:
1/ from card to NFS disk
2/ read from NFS disk
3/ stream to viewer app.

Doing this with HD streams before the patch set resulted in regular 
picture hickups. No hickups visible anymore (that i have seen, i have 
not been present all this time).

Regards,

Rudy
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