On Fri, Dec 15, 2017 at 09:38:06PM +0100, Mike Galbraith wrote: > On Fri, 2017-12-15 at 16:52 +0000, Mel Gorman wrote: > > > > It's a small improvement... > > From my log on corr.arch.suse.de (2x8 box) > > 4.15.0.g2db767d-default > Throughput 2665.88 MB/sec 8 clients 8 procs max_latency=21.472 ms > 4.15.0.g2db767d-default NO_WA_IDLE > Throughput 3416.35 MB/sec 8 clients 8 procs max_latency=9.825 ms > > Not so small improvement. WA_IDLE ripped corr up pretty bad, turning > it off restored 4.4 performance. >
Sounds plausible. I expect it depends on the remote access latency as well as whether the data gets prefetched fast enough. -- Mel Gorman SUSE Labs
