Heavy Bug Encountered on NFSv4 Server

[Thomas Hoppe]

Hi Bruce / List,

it seems like this problem is gone somehow.
Just to sum it up:

I just switched to another release of the Gentoo 2.6.20 Kernel
and since then, the error did not reoccur.
I don't think that the Gentoo guys mess with the NFS code
so the only explanation for me would be that in the vanilla
kernel ther was a fix for something NFS 4 related.
On the other hand I guess you

I have one further pressing questions regarding NFS 4
which I cannot answer based on any resourve about NFS 4.

How does an NFS 4 server handle multiple concurrent reads
on a single file? Say computer A is reading a file on
an NFS server. I have the feeling that during the read,
other Computers are blocked/queued from reading that file.
Is that assumption true?

My concrete scenario is that I have a webserver which exports
the web root to 6 webservers and whenever the load is high
I see that images load rather laggy.

thanks, Thomas


J. Bruce Fields schrieb:
> On Thu, May 31, 2007 at 01:26:41AM +0200, Thomas Hoppe wrote:
>   
>> Hi Bruce,
>>
>> I have switched to release R8 from release R6 of the 2.6.20 Gentoo Kernel
>> and so far I cannot reproduce it but this doesn't mean anything;
>> before it also ran for say a week without this problem and
>> then it occured every 3 days.
>>
>> What about the compilter,
>>     
>
> Shouldn't matter, I hope.
>
>   
>> I've compiled my whole system with -O3
>>     
>
> I've never tried to fiddle with the compile options for the kernel,
> though.  You're not trying to build it with -O3, are you?
>
> --b.
>
>   
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