On Mon, Mar 10, 2008 at 3:20 PM, Doron Shoham <[EMAIL PROTECTED]> wrote: > I used the following commands: > for write commands: > sgp_dd of=/dev/sg1 if=/dev/zero bs=512 bpt=<from 2-512> thr=8 time=1 > count=20M > for read commands > sgp_dd if=/dev/sg1 of=/dev/null bs=512 bpt=<from 2-512> thr=8 time=1 > count=20M > > And the results are (all in MB/s): > bpt: 2 4 8 16 32 64 128 256 > 512 > Write 22.5 41.4 80.6 160 275 443 570 740 > 810 > Read 42 80 170 313 550 940 1200 1312 > 1300 > > What can be the reason for such difference between the bandwidth of Read and > Write commands?
Can you please try to use direct I/O instead of buffered I/O ? Bart. _______________________________________________ ewg mailing list ewg@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg
