From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vyacheslav Dubeyko Subject: Re: Strange "flush" process bahaviour Date: Tue, 13 Nov 2012 10:13:38 +0400 Message-ID: <1352787218.2042.9.camel@slavad-ubuntu> References: <50A159BC.9060600@li.ru> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=dubeyko.com; s=default; h=Mime-Version:Content-Transfer-Encoding:Content-Type:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID; bh=o9DhEsSOYvu2lxtBkSy74X4a/CBezcn34/Os/LZOEBc=; b=S1B7I55ytq7gfdkL1WS8uhryE4cuR9v7SWY4FLkAKtOQRaBng2Z76L/eVsaqJ8TxB2WITtfg/+V6iBGDf8KUjO6vThmJ32JWp5VSTAeEk3sBs1mWtKNL68/cGWnimYV1; In-Reply-To: <50A159BC.9060600-3TRaYzfGuuI@public.gmane.org> Sender: linux-nilfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: fwdnilfsml.to.11df-2pMamKoQTv4@public.gmane.org Cc: linux-nilfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Hi, On Tue, 2012-11-13 at 00:19 +0400, fwdnilfsml.to.11df-2pMamKoQTv4@public.gmane.org wrote: > Hello! > Some time ago I've noticed, that "flush" kernel process associated with > device running nilfs2 filesystem, generate huge amount of IO activity > (using 100% CPU time). "iotop" utility show speeds about 5-15 GB\S on > that "flush" process, but no actual disk activity happens. Sorry, but I have some misunderstanding. From one point of view, you said that filesystem generates I/O activity but as a result you haven't disk activity. Does it means that you create any files but you haven't it on partition after umount? > This condition lasts about 1-2 minutes, and then it stops for some time > (usually 10-20 minutes). > > Is this a normal behavior ? I'm using kernel 3.6, and nilfs running on > luks-encrypted partitions, that belongs to software raid-1 array. > Could you share more details about your configuration and situation? Please, share: 1. System log content related to the problem (NILFS2, I/O subsystem). 2. Output of "top" and "ps -ax" in the case of the issue. 3. Describe your partitions and disks configuration ("mount" output, "cat /proc/partitions" output). 4. Output of "lscp" and "lssu". With the best regards, Vyacheslav Dubeyko. > //Sorry for my English > > -- > To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html