Date: Tue, 5 May 2009 20:25:36 +0200 From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net> To: freebsd-questions@freebsd.org Cc: Frederique Rijsdijk <frederique@isafeelin.org>, nf <nf@wh3rd.net> Subject: Re: Poor ZFS performance Message-ID: <200905052025.36255.mel.flynn%2Bfbsd.questions@mailing.thruhere.net> In-Reply-To: <e2fbd2a10905031707w572f956s53af85cb126ddd6@mail.gmail.com> References: <e2fbd2a10905011639x475c1fbex92508493449bff51@mail.gmail.com> <49FC10DE.9000401@isafeelin.org> <e2fbd2a10905031707w572f956s53af85cb126ddd6@mail.gmail.com>
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On Monday 04 May 2009 02:07:41 nf wrote: > On Sat, May 2, 2009 at 7:22 PM, Frederique Rijsdijk > > <frederique@isafeelin.org> wrote: > > nf wrote: > >> 733843456 bytes transferred in 61.124812 secs (12005656 bytes/sec) > > > > That is very low. I get about 60MB/sec in this way. Adding bs=1m it'll go > > up to 240MB/sec even (raidz1 with 4*1TB). > > > > Could you show top -S ? > > I will, the next time I experience the issue. > > I had already rebooted the box, which immediately alleviated the > issue. I can only presume, at this point, that it seems to have been > related to the 2gb of allocated/active memory shown by top. I had no > memory intensive apps running, merely an idle lighttpd, mysqld, and > rtorrent (which only occupied about 90mb). There's a thread or 2 on -current list about ZFS arc cache growth, that you may or may not be seeing as well. <http://www.freebsd.org/cgi/mid.cgi?id=20090417145024.205173ighmwi4j0o@webmail.leidinger.net&db=mid>; -- Mel
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