From owner-freebsd-usb@FreeBSD.ORG Tue Aug 30 12:50:37 2005 Return-Path: X-Original-To: freebsd-usb@freebsd.org Delivered-To: freebsd-usb@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 71AB916A41F; Tue, 30 Aug 2005 12:50:37 +0000 (GMT) (envelope-from freebsd@rea.mbslab.kiae.ru) Received: from rea.mbslab.kiae.ru (rea.mbslab.kiae.ru [144.206.177.25]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0675343D46; Tue, 30 Aug 2005 12:50:36 +0000 (GMT) (envelope-from freebsd@rea.mbslab.kiae.ru) Received: from rea.mbslab.kiae.ru (localhost [127.0.0.1]) by rea.mbslab.kiae.ru (Postfix) with ESMTP id 32AA7BB0A; Tue, 30 Aug 2005 16:50:32 +0400 (MSD) Received: by rea.mbslab.kiae.ru (Postfix, from userid 1000) id F30DFBAD0; Tue, 30 Aug 2005 16:50:31 +0400 (MSD) Date: Tue, 30 Aug 2005 16:50:31 +0400 From: "Eygene A. Ryabinkin" To: Eugene Grosbein Message-ID: <20050830125031.GA775@rea.mbslab.kiae.ru> References: <20050830092818.GD881@rea.mbslab.kiae.ru> <4314523D.79926C81@kuzbass.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Disposition: inline In-Reply-To: <4314523D.79926C81@kuzbass.ru> User-Agent: Mutt/1.5.9i X-AV-Checked: Yes! Cc: hackers@freebsd.org, freebsd-usb@freebsd.org Subject: Re: Low umass performance with USB 2.0 ports X-BeenThere: freebsd-usb@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: FreeBSD support for USB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Aug 2005 12:50:37 -0000 > > What is filesystem has your USB drive? The one I was extensively testing has FAT, but I've checked the UFS2 -- just a bit better -- 1.8 Mb/second. But you're right -- no wdrains at all. > FreeBSD 4.x had very low performance with FAT filesystem, > writing process spent lots of time in the wdrain state too. Yes, it has. But here the same flash drive gives different results for ehci and uhci devices, and the total speed of echi is lower due to wdrains: 300 Kb/sec versus 500 Kb/sec. And I sometimes write my data to the Windows partition with FAT to my home HDD -- it has no wdrains. At least, I've not noticed them. For flash I can. -- rea