From: Dan Smith <danms@xxxxxxxxxx> Subject: Re: Thoughts on removing the remap cache Date: Sat, 30 Sep 2006 08:44:26 -0700 > FT> I guess that dbench generates relatively large size I/Os than > FT> common workloads, which is more sensitive to latency. > > Right, that is what I am thinking. However, dbench inside a domU does > not perform well either. Even running dbench inside a domU, the > batches that the userspace daemon sees are only about 10 requests, > compared to several thousand at times when running on bare metal. > > FT> Seems that Xen camp is pretty happy with blktap. So dm-userspace > FT> should be ok with domU. Maybe it's time to try ring buffer stuff > FT> again. :) > > You think that the ring buffer has the potential to be lower latency > due to fewer memcpy()'s right? Yeah, though there might be other factors, I guess. Anyway, could you try the new ring buffer patch that I posted? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
