On 12/04/2014 09:28 AM, Jeff Layton wrote: > On Thu, 04 Dec 2014 09:17:17 -0800 > Shirley Ma <shirley.ma@xxxxxxxxxx> wrote: > >> > I am looking at how to reduce total RPC execution time in NFS/RDMA. mountstats output shows that RPC backlog wait is too long, but increasing the credit limit doesn't seem help. Would this patchset help reducing total RPC execution time? >> > >> > Shirley >> > > I'm not sure. It depends on why you're seeing a backlog. What's the major factors contributing RPC backlog wait time? I guess I need to probe the backlog wait path to display fine-grained latency cost. > So far, my testing still shows this to be slightly (~2%) slower than the > same setup running a threaded nfsd, but that could be different with a > NUMA server or faster disks. > > Probably there is some more tuning to do here before this is quite > ready for prime-time. It may be worth testing in your environment > though if you have the time and ability to do so. > >> > On 12/04/2014 03:47 AM, Jeff Layton wrote: >>> > > I was using ftrace with the sunrpc:* and workqueue:* tracepoints, and >>> > > had a simple perl script to postprocess the trace info to figure out >>> > > average/min/max latency. -- 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
