From owner-freebsd-stable@FreeBSD.ORG Wed Aug 4 14:15:09 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 CA9221065675 for ; Wed, 4 Aug 2010 14:15:09 +0000 (UTC) (envelope-from alexvpetrov@gmail.com) Received: from mail-ey0-f182.google.com (mail-ey0-f182.google.com [209.85.215.182]) by mx1.freebsd.org (Postfix) with ESMTP id 596C28FC1E for ; Wed, 4 Aug 2010 14:15:09 +0000 (UTC) Received: by eyh6 with SMTP id 6so2279527eyh.13 for ; Wed, 04 Aug 2010 07:15:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:subject:date :user-agent:references:in-reply-to:mime-version:message-id:cc :content-type:content-transfer-encoding; bh=04q3tMxUNrWavDjd7p7ESBmdzKzZlzNwhKyswFXTih8=; b=rauXfxjAC0WktYNB90xGycZokjOeaXAOTeLPrKaqxWmXBFDjL2GkZbTElRg6Zu4Cgw ysI/VOvGvr650Ano18TDADqi0CzrFxxg4dp+hXm7ZXpNrmCmB1gddo/GN+Ch2dkdXEgA vcSXsSh71g2iZzLdcN6Xo+y6svRX+sCMozTE4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:user-agent:references:in-reply-to:mime-version :message-id:cc:content-type:content-transfer-encoding; b=EgGS51yYwu/RYxaeNXOdTEDIc5b2KlfBZDl7ECbuwLqJOMdwbi958x3ktWTDpcb+2C 4u2ynEol1+iU0SlH+ATCe4Da5hORkS3YGuj3Gmxe+7z/cGnE0IoVsTcgFFs9Uh6ECHDI 1rI61ysjHBs3jB8uRJxZGfcEL5UnSTpBXD3UU= Received: by 10.14.48.3 with SMTP id u3mr3360682eeb.67.1280931308461; Wed, 04 Aug 2010 07:15:08 -0700 (PDT) Received: from alex.super ([91.195.101.86]) by mx.google.com with ESMTPS id v59sm12853261eeh.4.2010.08.04.07.15.04 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 04 Aug 2010 07:15:07 -0700 (PDT) From: "Alex V. Petrov" To: Andriy Gapon Date: Wed, 4 Aug 2010 22:14:58 +0800 User-Agent: KMail/1.13.5 (FreeBSD/8.1-STABLE; KDE/4.4.5; amd64; ; ) References: <201008042008.25679.alexvpetrov@gmail.com> <4C5960E6.7060702@icyb.net.ua> In-Reply-To: <4C5960E6.7060702@icyb.net.ua> MIME-Version: 1.0 Message-Id: <201008042214.59264.alexvpetrov@gmail.com> Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Cc: freebsd-stable@freebsd.org Subject: Re: zpool - low speed write 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: Wed, 04 Aug 2010 14:15:09 -0000 =D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1=82 = 4 =D0=B0=D0=B2=D0=B3=D1=83=D1=81=D1=82=D0=B0 2010 20:45:26 =D0=B2=D1=8B =D0= =BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB=D0=B8: > on 04/08/2010 15:08 Alex V. Petrov said the following: > > Hi All! > >=20 > > $ dd if=3D/dev/random of=3D/tank/test bs=3D3M count=3D1000 >=20 > /dev/random is slow. On single disk (UFS) speed of write faster: $ dd if=3D/dev/random of=3D/home/alex/temp/test bs=3D3M count=3D1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 75.778427 secs (41512184 bytes/sec) Result for /dev/zero: $ dd if=3D/dev/zero of=3D/tank/test bs=3D3M count=3D1000 1000+0 records in 1000+0 records out 3145728000 bytes transferred in 113.110421 secs (27811124 bytes/sec) In Krusader speed copying files from a single disk to an pool of about 8 MB= /s =46ragment of `systat -v 1` in proces copying: Disks ada0 ada1 ada2 ada3 ada4 KB/t 0,00 122 44,35 32,89 48,50 tps 0 54 56 53 54 MB/s 0,00 6,42 2,42 1,70 2,55 %busy 0 11 7 4 82 =2D---- Alex V. Petrov