On Thu, 7 Feb 2008 13:20:16 -0500 Pete Wyckoff <pw at osc.edu> wrote: > pw at osc.edu wrote on Thu, 07 Feb 2008 11:57 -0500: > > bart.vanassche at gmail.com wrote on Thu, 07 Feb 2008 17:04 +0100: > > > Results on Ethernet: > > > For a block size of 512 KB: write throughput of 43 MB/s. > > > For a block size of 1 MB: write throughput of 15 MB/s. > > > > Redoing the tests at 1G keeps it all in RAM for me. Then I get 95 > > MB/s at 512 kB and 88 MB/s at 1MB, so confirming your performance > > disparity, but not finding numbers nearly so bad. > > I looked at logs on tgtd. These are writes. With my kernel, the 1M > case just sends two 512k requests back-to-back due to initiator > block limits. So there are an identical series of requests in both > cases. With the current git tree, it's possible to send a 1MB SCSI request, I think. |