[linux-cifs-client] Re: poor cifs write performance and high CPU load with large files (500MB+) compared to smbfs

Steven French sfrench at us.ibm.com
Mon Jun 6 17:08:53 GMT 2005






1.28 did not support the direct option, so your results make sense,
performance with forcedirectio is better because you are saving memory by
avoiding client caching for a file that is not reused, and memory is not
getting fragmented as heavily (cifs buffer allocations are large enough,
just over 4 pages, to cause fragmentation).

I am most of the way through a change to allow cifs_writepage to only
allocate a small buffer but it is not quite ready to checkinto the tree
yet.


Steve French
Senior Software Engineer
Linux Technology Center - IBM Austin
phone: 512-838-2294
email: sfrench at-sign us dot ibm dot com
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