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. -- Jon -- 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
