From owner-freebsd-stable@FreeBSD.ORG Fri Oct 29 13:14:37 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 50D18106564A for ; Fri, 29 Oct 2010 13:14:37 +0000 (UTC) (envelope-from alexz@visp.ru) Received: from mail.visp.ru (srv1.visp.ru [91.215.204.2]) by mx1.freebsd.org (Postfix) with ESMTP id 028688FC12 for ; Fri, 29 Oct 2010 13:14:36 +0000 (UTC) Received: from 91-215-205-255.static.visp.ru ([91.215.205.255] helo=zagrebin) by mail.visp.ru with esmtp (Exim 4.72 (FreeBSD)) (envelope-from ) id 1PBomv-0006DK-Km; Fri, 29 Oct 2010 17:14:33 +0400 From: "Alexander Zagrebin" To: "'Andriy Gapon'" References: <3D1C350B94A44E5D95BAA1596D1EBF13@vosz.local> <4CCABF73.8070707@icyb.net.ua> Date: Fri, 29 Oct 2010 17:14:33 +0400 Keywords: freebsd-stable Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 In-Reply-To: <4CCABF73.8070707@icyb.net.ua> Thread-Index: Act3ZdsC2F3venc4Rcmi6iFCEPFVAAAA4chA Cc: freebsd-stable@freebsd.org Subject: RE: 8.1-STABLE: zfs and sendfile: problem still exists X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Oct 2010 13:14:37 -0000 > > I've noticed that ZFS on 8.1-STABLE still has problems with > sendfile. > > Which svn revision, just in case? 8.1-STABLE The source tree was updated 2010-10-27 > > 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? IMHO, ftpd hasn't an option to disable sendfile. I've tried the nginx with disabled sendfile (the nginx.conf contains "sendfile off;"): $ dd if=/dev/random of=test bs=1m count=100 100+0 records in 100+0 records out 104857600 bytes transferred in 5.892504 secs (17795083 bytes/sec) $ fetch -o /dev/null http://localhost/test /dev/null 100% of 100 MB 41 MBps $ fetch -o /dev/null http://localhost/test /dev/null 100% of 100 MB 44 MBps $ fetch -o /dev/null http://localhost/test /dev/null 100% of 100 MB 44 MBps -- Alexander Zagrebin