On Mon, Feb 01, 2010 at 11:33:53AM +0200, Pasi Kärkkäinen wrote: > On Thu, Jan 28, 2010 at 01:44:00PM -0500, Joe Landman wrote: > > Pasi Kärkkäinen wrote: > > > >> I think SFP+ 10 Gbit has 0.6usec latency.. ? 10GBase-T is 2.6 usec. > > > > > > http://www.mellanox.com/pdf/whitepapers/wp_mellanox_en_Arista.pdf > > > > This one is from 2008.. > > > They are reporting 7+ us latency. ConnectX are a bit better on latency > > than the Intel NICs. > > > > http://www.ednasia.com/article-24923-solarflarearistanetworkspublishtestreportdemonstratinglowlatencywith10gbe-Asia.html > > > > shows latency, server to server of ~5us. This is about what you expect > > (and why 10GbE isn't quite to IB capability yet in low latency apps). > > > > Yeah.. well, I don't seem to be able to find better data :) >
Marketing stuff again: http://www.aristanetworks.com/media/system/pdf/CloudNetworkLatency.pdf "Arista Cut-through Design: Intra-Rack Latency: 0.6us, Inter-Rack Latency: 2.4us". > > I suspect that they really aren't seeing ~1us latencies, but that with > > some neat tricks, it appears to be this. > > > > Physically, it isn't there. I'd classify this as a "marketing number" > > (e.g. unachievable in applications that matter). I'd be happy to be > > proven wrong, but there really isn't much to suggest that I am wrong. > > > Thinking about this again.. how can they cheat? That >million IOPS was the iometer reported benchmark result? Of course they used ramdisks on the iscsi targets etc.. -- Pasi -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-is...@googlegroups.com. To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=en.
