Date: Fri, 29 Oct 2010 15:34:59 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Alexander Zagrebin <alexz@visp.ru> Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org Subject: Re: 8.1-STABLE: zfs and sendfile: problem still exists Message-ID: <4CCABF73.8070707@icyb.net.ua> In-Reply-To: <3D1C350B94A44E5D95BAA1596D1EBF13@vosz.local> References: <3D1C350B94A44E5D95BAA1596D1EBF13@vosz.local>
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on 28/10/2010 08:57 Alexander Zagrebin said the following: > Hi! > > I've noticed that ZFS on 8.1-STABLE still has problems with sendfile. Which svn revision, just in case? > When accessing a file at first time the transfer speed is too low, but > on following attempts the transfer speed is normal. > > How to repeat: > > $ dd if=/dev/random of=/tmp/test bs=1m count=100 > 100+0 records in > 100+0 records out > 104857600 bytes transferred in 5.933945 secs (17670807 bytes/sec) > $ sudo env LC_ALL=C /usr/libexec/ftpd -D > > The first attempt to fetch file: > > $ fetch -o /dev/null ftp://localhost/tmp/test > /dev/null 1% of 100 MB 118 kBps > 14m07s^C > fetch: transfer interrupted > > The transfer rate is too low (approx. 120 kBps), but any subsequent attempts > are success: > > $ fetch -o /dev/null ftp://localhost/tmp/test > /dev/null 100% of 100 MB 42 MBps > $ fetch -o /dev/null ftp://localhost/tmp/test > /dev/null 100% of 100 MB 47 MBps Can you do an experiment with the same structure but sendfile excluded? -- Andriy Gapon
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