Hi Michael, so your tests wer now exectued on a bloody host ?
indicating that the performance went back up in bloody ? cheers tobi Today Michael Mounteney wrote: > Sorry to take so long to get back to you Tobias and I hope this is > still relevant. As described elsewhere in this list, I had temporarily > to downgrade ssh to achieve interoperability between the OmniOS (bloody) > host and the Gentoo Linux guests. > > First, ssh imposes some overhead: > > mounty@pantry ~ $ time ssh people exit > > real 0m0.724s > user 0m0.032s > sys 0m0.012s > > that real figure averages around the 0.750s mark. So I decided to > perform much bigger transfers to minimise its effect: > > mounty@pantry ~ $ dd if=/dev/zero bs=1M count=2000 | ssh people dd > of=/dev/null > 2000+0 records in > 2000+0 records out > 2097152000 bytes (2.1 GB) copied, 138.436 s, 15.1 MB/s > 4096000+0 records in > 4096000+0 records out > 2097152000 bytes transferred in 137.657582 secs (15234555 bytes/sec) > > mounty@pantry ~ $ ssh people dd if=/dev/zero bs=1M count=2000 | dd > of=/dev/null > 2000+0 records in > 2000+0 records out > 2097152000 bytes transferred in 51.692313 secs (40569901 bytes/sec) > 4096000+0 records in > 4096000+0 records out > 2097152000 bytes (2.1 GB) copied, 52.4503 s, 40.0 MB/s > > It is puzzling that the in and out figures are so different but I did > perform each test three times and the results were approximately the > same each time. On the read-off-disk test, here are all three runs: > > pantry ~ # dd if=/dev/vda of=/dev/zero bs=1M count=1000 > 1000+0 records in > 1000+0 records out > 1048576000 bytes (1.0 GB) copied, 65.3406 s, 16.0 MB/s > pantry ~ # dd if=/dev/vda of=/dev/zero bs=1M count=1000 > 1000+0 records in > 1000+0 records out > 1048576000 bytes (1.0 GB) copied, 1.19789 s, 875 MB/s > pantry ~ # dd if=/dev/vda of=/dev/zero bs=1M count=1000 > 1000+0 records in > 1000+0 records out > 1048576000 bytes (1.0 GB) copied, 1.85877 s, 564 MB/s > > which I've quoted to show that the disk must be cached. So I tried > again with more data to eliminate that effect: > > pantry ~ # dd if=/dev/vda of=/dev/zero bs=1M count=10240 > 10240+0 records in > 10240+0 records out > 10737418240 bytes (11 GB) copied, 710.215 s, 15.1 MB/s > > I hope that's helpful. > > Michael. > _______________________________________________ > OmniOS-discuss mailing list > OmniOS-discuss@lists.omniti.com > http://lists.omniti.com/mailman/listinfo/omnios-discuss > > -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland www.oetiker.ch t...@oetiker.ch +41 62 775 9902 _______________________________________________ OmniOS-discuss mailing list OmniOS-discuss@lists.omniti.com http://lists.omniti.com/mailman/listinfo/omnios-discuss
