Date: Sat, 19 Feb 2005 14:36:07 +0100 From: Borja Marcos <borjamar@sarenet.es> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-hackers@freebsd.org Subject: Re: High traffic NFS performance and availability problems Message-ID: <1ce55dabd3ee00efb4f717463716be22@sarenet.es> In-Reply-To: <Pine.NEB.3.96L.1050219122403.67347M-100000@fledge.watson.org> References: <Pine.NEB.3.96L.1050219122403.67347M-100000@fledge.watson.org>
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> I think leaving the 4.x clients in a known configuration and just > varying > the server configurations the right starting point. Let's try tracking > the server 5.x stability/performance first, then look into the client > 4.x > crash reports. I've seen amazing performance differences between 4.9 and 5.3 in one case: a mail server with Cyrus-imapd and a MySQL database for authentication, using fiberchannel disk arrays. I couldn't do elaborate benchmarks (it is a production system) but I ran into a situation in which 4.9 spent about 90 % of CPU time in system (mostly syncer) and, just upgrading to 5.3 the problem disappeared. In both cases I had tuned some system variables (and I haven't changed the variables between 4.9 and 5.3). Notably, I set up a dirhash cache of 64 MB, because the machine had lots of huge directories. The workload is now the same, and it's working like a charm. The machine is a Dell Poweredge 2650 with two CPUs. Borja.
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