On Tue, 9 Jul 2013 13:22:53 +1000 NeilBrown <neilb@xxxxxxx> wrote: > A customer upgraded from SLES10 (2.6.16 based) to SLES11 (3.0 based) and saw > a slowdown on some large DB jobs of between 1.5 and 2 times (i.e. total time > 150% to 200% of what is was before). > After some analysis they created multiple virtual IPs on the server and > mounted the several filesystem each from different IPs and got the > performance back (they see this as a work-around rather than a genuine > solution). > Numbers are like "500MB/s on a single connection, 850MB/sec peaking to > 1000MB/sec on multiple connections". > > If I can get something more concrete I'll let you know. Slightly more concrete: 4 mounts from the one server, 10 threads of fio on each mount. All over a 10G Ethernet. 1 IP address without "nosharetransport": ~700MB/s 4 IP addresses without "nosharetransport": ~1100MB/s 1 IP address with "nosharetransport": ~1100MB/s This is all NFSv3. NFSv4 is much slower with nosharecache (32MB/s!), but I might have botched the backport to 3.0 (or didn't address the v4 specific issues you raised). I haven't looked into that yet. NeilBrown
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