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

[Martin Koeppe]

In addition to the tests mentioned in
http://lists.samba.org/archive/linux-cifs-client/2005-May/000841.html
I now tested the following on a real machine (not VM),
connected via Gigabit-Ethernet:

 kernel          cifs       mount-opt    speed             cpu-usage
 -------------------------------------------------------------------
 Debian-2.6.11   1.28       -      4 MB/s decreasing to 1 MB/s   85%
 Debian-2.6.11   1.28       direct       5 MB/s -> 1 MB/s        85%
 
 Debian-2.6.11   1.34       -            4 MB/s -> 1 MB/s        85%
 Debian-2.6.11   1.34       direct       10 MB/s constantly      40%

 vanilla-2.6.9   1.34RHEL4  -            4 MB/s -> 1 MB/s        85%
 vanilla-2.6.9   1.34RHEL4  direct       10 MB/s constantly      40%


Martin