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DateFri, 27 Aug 2004 09:25:21 +0100
FromDavid Greaves <>
SubjectRe: POSIX_FADV_NOREUSE and O_STREAMING behavior in 2.6.7
Trond Myklebust wrote:

>På to , 26/08/2004 klokka 14:38, skreiv David Greaves:
> 
>
>>David Rolenc wrote:
>>
>> 
>>
>>>I am trying to get O_STREAMING (Robert Love patch for 2.4) behavior in 
>>>2.6 and just a glance at fadvise.c suggests that POSIX_FADV_NOREUSE is 
>>>not implemented any differently than POSIX_FADV_WILLNEED. Am I missing 
>>>something?  I want to read data from disk with readahead and drop the 
>>>data from the page cache as soon as I am done with it. Do I have to 
>>>call fadvise with POSIX_FADV_DONTNEED after every read?
>>> 
>>>
>>And will this work over nfs?
>> 
>>
>
>What do you mean?
>
>The client will of course respect fadvise() if the generic VM code
>supports it, but there is no NFS protocol support for this, so the
>client is not able to communicate your fadvise call on to the server.
> 
>
Perfect answer
thank you

I want my nfs client to communicate this to my nfs server. Thus avoiding 
my nfs server having a cache of useless video.
I can see this becoming an important benefit for video distribution (an 
area linux is likely to see more of)

David

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