2009/7/31 Jon Nelson <jnelson-suse@xxxxxxxxxxx>: > 2009/7/31 Keld Jørn Simonsen <keld@xxxxxxxx>: >> On Thu, Jul 30, 2009 at 02:09:19PM -0700, David Rees wrote: >>> On Mon, Jul 27, 2009 at 12:19 PM, Jon Nelson<jnelson-suse@xxxxxxxxxxx> wrote: >>> > When I say "bad performance" I mean writes that vary down to 100KB/s >>> > or less, as reported by rsync. The "average" end-to-end speed for >>> > writing large (500MB to 5GB) files hovers around 3-4MB/s. This is over >>> > 100 MBit. >>> >>> That doesn't sound too unexpected. rsync does a lot of reading and >>> writing, so you're going to see less than network speeds. >> >> rsync also does a lot of computing, so that is also a source of delay. >> For faster cpu's the delay is not so big. I get near network speed ( 80 >> Mbit/s on a 100 Mbit/s LAN) between two of my faster machines. > > In this case, you may all be assured it was not doing much reading > over NFS or computing, as the file did not exist on the NFS share - in > this case NFS goes into (more or less) pure write mode - no updating > per-se. OK, so how fast does a simple dd write to the NFS share? -Dave -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
