David Collier-Brown -- Customer Engineering
David.Collier-Brown at sun.com
Thu Jul 10 18:51:51 GMT 2003
Nicholas M. Kirsch wrote:
>> I have done some work in this area, primarily to deal
>>with filesystems which want quite large, aligned reads.
>>Notably RAID disk arrays!
>> Can you describe your application to us? The cache read
>>code **might** address your problem.
> I have a very large (several terabyte) filesystem and I want good
> single-stream read performance from it. The applications which do this are
> many, including media streaming and simple file access in a single-stream
> linear fashion.
Interseting; Steve French at IBM is also working on sibgle-stream
performance, but at the Linux level...
> I am working on a NAS appliance, which uses Samba 3.0 to provide CIFS
> access to its content. Will your cache read code instruct the client to
> read-ahead? What appears to happen is the CIFS client sends a read
> request, and waits for the answer before sending another. In this
> scenario, throughput will be limited by latency. It appears as if NFS gets
> around this by sending multiple read requests at a single time.
> I am not sure whether CIFS supports such things, just hoping.
Alas, what I was doing was filesystem read-ahead, so that
Samba's latency in delivering the single threaded,
stop-and-wait stream was as small as possible.
David Collier-Brown, | Always do right. This will gratify
Sun Microsystems DCMO | some people and astonish the rest.
Toronto, Ontario |
(905) 415-2849 or x52849 | davecb at canada.sun.com
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