From owner-freebsd-current@FreeBSD.ORG Sat Mar 2 20:46:44 2013 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id D81241EC for ; Sat, 2 Mar 2013 20:46:44 +0000 (UTC) (envelope-from etnapierala@gmail.com) Received: from mail-bk0-f52.google.com (mail-bk0-f52.google.com [209.85.214.52]) by mx1.freebsd.org (Postfix) with ESMTP id 1C06F1A3 for ; Sat, 2 Mar 2013 20:46:43 +0000 (UTC) Received: by mail-bk0-f52.google.com with SMTP id jk13so1803479bkc.25 for ; Sat, 02 Mar 2013 12:46:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:sender:subject:mime-version:content-type:from :in-reply-to:date:cc:content-transfer-encoding:message-id:references :to:x-mailer; bh=Q8dHNBz1TjRR2kNtB1EPjKIRENdoC+D1fNZ6y8KNU/4=; b=v9WYyvW63y9REKuaU4ISXfOkAh/9KjWDzqRm2WWg7z8Z/sXmJud50VzRyhjaW2AK0W IliktVUnfG849cM20OYNT5voB6pBHs7Xfv9jfVsGchqajSBVtztYmXrZSHRsouk2Ym/o DlJXDiQ2DGXk718wotbNztNmqcRE+Fx6sfttiGPyatBaN2mc61UhdIgMhGged1v8UmQU 4ZN/j4xylFdkQdbqvFh8tg9JxDGxU5gTWVCZx8vyEw7X3lWp14koFUPTWHGWdmN2rXdA fsRGlWwLtbGGNGfbOZ3f6LgBtDJ/0kQj9L9CMbxcsagYV64PY0EjDyid2s5u3o3+tcgU cThQ== X-Received: by 10.205.136.205 with SMTP id il13mr5424559bkc.93.1362257202646; Sat, 02 Mar 2013 12:46:42 -0800 (PST) Received: from [192.168.1.104] (45.81.datacomsa.pl. [195.34.81.45]) by mx.google.com with ESMTPS id x10sm4166447bkv.13.2013.03.02.12.46.41 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 02 Mar 2013 12:46:41 -0800 (PST) Sender: =?UTF-8?Q?Edward_Tomasz_Napiera=C5=82a?= Subject: Re: access to hard drives is "blocked" by writes to a flash drive Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=iso-8859-2 From: =?iso-8859-2?Q?Edward_Tomasz_Napiera=B3a?= In-Reply-To: <51323712.5000406@gmail.com> Date: Sat, 2 Mar 2013 21:46:39 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <42B72A5B-A363-426B-9F6C-7F8B3B7E7543@FreeBSD.org> References: <51323712.5000406@gmail.com> To: deeptech71 X-Mailer: Apple Mail (2.1283) Cc: freebsd-current@freebsd.org X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 02 Mar 2013 20:46:44 -0000 Wiadomo=B6=E6 napisana przez deeptech71 w dniu 2 mar 2013, o godz. = 18:29: > When one of my flash drives is being heavily written to; typically by = ``svn update'' on /usr/src, located on the flash drive; the following = can be said about filesystem behavior: >=20 > - ``svn update'' seems to be able to quickly update a bunch of files, = but is then unable to continue for a period of time. This behavior is = cyclical, and cycles several times, depending on the amount of updating = work to be done for a particular run of ``svn update''. > - Access to any filesystem, whether on the said flash drive or not, = seems to be hindered a lot, typically during the said "unable to = continue" time. Reading of a file on a hard drive was once delayed for = more than 10 seconds. Seemingly as a consequence, the starting of top(1) = is also typically delayed. When that happens, could you do "ps axl" and see the WCHAN column for the affected processes? Is it "wdrain"? --=20 If you cut off my head, what would I say? Me and my head, or me and my = body?