Date: Tue, 09 Jul 2013 11:11:01 +0300 From: Daniel Kalchev <daniel@digsys.bg> To: freebsd-fs@freebsd.org Subject: Re: Terrible NFS4 performance: FreeBSD 9.1 + ZFS + AWS EC2 Message-ID: <51DBC595.4020407@digsys.bg> In-Reply-To: <87a9lwyy16.wl%berend@pobox.com> References: <87y59i0yni.wl%berend@pobox.com> <580122426.2916694.1373242759482.JavaMail.root@uoguelph.ca> <87a9lwyy16.wl%berend@pobox.com>
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On 09.07.13 10:48, Berend de Boer wrote: > OK, completely disregard my previous email. I actually was testing > against a server in a different data centre, didn't think it would > matter too much, but clearly it does (ping times 2-3 times higher). > Could you please actually post a diagram of your setup, with all the components, including the "low spec Linux server". Do not forget the RTT (ping) between these hosts. If you have made any network tuning too. Networking protocols like NFS are heavily influenced by factors like RTT. An "underpowered" box that is "nearby" (has lover RTT) usually performs much better than a "powerful box" with larger RTT and other network bottlenecks. Unfortunately, AWS is far from perfect hardware emulation and there might be other layers that intervene with the NFS protocol. Daniel
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