http://client.linux-nfs.org/Linux-2.6.x/2.6.10/linux-2.6.10-33-access_cache.dif

http://client.linux-nfs.org/Linux-2.6.x/2.6.10/linux-2.6.10-33-access_cache.dif

[Mark Goodman]

This patch appears to have the effect that non-existent files don't get 
cached. When I apply it to 2.6.10, a C preprocessor workload that 
involves opening lots of non-existent files slows down by an order of 
magnitude and I notice tens of thousands of NFS ACCESS calls per second 
according to nfsstat.

Mark



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Re: [NFS] http://client.linux-nfs.org/Linux-2.6.x/2.6.10/linux-2.6.10-33-access_cache.dif

[Trond Myklebust]

lau den 05.02.2005 Klokka 01:50 (-0800) skreiv Mark Goodman:
> This patch appears to have the effect that non-existent files don't get 
> cached. When I apply it to 2.6.10, a C preprocessor workload that 
> involves opening lots of non-existent files slows down by an order of 
> magnitude and I notice tens of thousands of NFS ACCESS calls per second 
> according to nfsstat.

Nope. NFS_ACCESS can only be called on files that *do* exist.

Are you sure that you are not using it on directories that are changing
a lot?

Cheers,
  Trond

-- 
Trond Myklebust <trond.myklebust@fys.uio.no>



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Re: [NFS] http://client.linux-nfs.org/Linux-2.6.x/2.6.10/linux-2.6.10-33-access_cache.dif

[Mark Goodman]

Trond Myklebust wrote:

>lau den 05.02.2005 Klokka 01:50 (-0800) skreiv Mark Goodman:
>  
>
>>This patch appears to have the effect that non-existent files don't get 
>>cached. When I apply it to 2.6.10, a C preprocessor workload that 
>>involves opening lots of non-existent files slows down by an order of 
>>magnitude and I notice tens of thousands of NFS ACCESS calls per second 
>>according to nfsstat.
>>    
>>
>
>Nope. NFS_ACCESS can only be called on files that *do* exist.
>
>Are you sure that you are not using it on directories that are changing
>a lot?
>
>Cheers,
>  Trond
>
>  
>
Yes, the directories are not changing.

Mark



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