On Tue, Dec 18, 2012 at 03:52:48PM +0000, Keith Edmunds wrote: > Accessing disks locally on a server gives read speeds around 100MB/s, > write speeds around 267MB/s. > > Mounting the same disks on the same server via NFS (ie, not using the > network at all) gives read speeds around 30MB/s, write speeds around > 80MB/s. > > That's about 30% of the local access speed. > > Is that to be expected? I'd expect a 10-15% slowdown, but not this much. > > This is using NFSv4; using NFSv3 improves the speeds slightly (36MB/s > read, 95MB/s write). What are your disks? How exactly are you getting those numbers? (Literally, step-by-step, what commands are you running?) What kernel version? Note loopback-mounts (client and server on same machine) aren't really fully supported. --b. > > Other parameters we've changed, none of which have a significant impact: > > - UDP/TCP > - rsize and wsize > - noatime > - noacl > - nocto > > If that's an unexpected slow down, where should we be looking? > > Thanks. > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
