From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ifkkU-0008UL-Fd for barebox@lists.infradead.org; Fri, 13 Dec 2019 13:12:52 +0000 Date: Fri, 13 Dec 2019 14:12:42 +0100 From: Sascha Hauer Message-ID: <20191213131242.nznq2yhasvfmp7s6@pengutronix.de> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [BUG] imx6qdl: degraded eMMC write performance To: Hubert Feurstein Cc: barebox@lists.infradead.org On Tue, Dec 10, 2019 at 03:44:52PM +0100, Hubert Feurstein wrote: > Hi, > > I've updated barebox for our custom platform from v2015.06.0 to > v2019.12.0. With the new version I have noticed a much worse write > performance onto the onboard eMMC. > > With v2015.06.0 the indicated progress of the copy command is very > smooth. Calling "cp -v /dev/zero /dev/mmc3.root" takes about 80 > seconds for 256MB. But with v2019.12.0 the progress is very bumpy and > the copy takes about 280 seconds. > > I've tracked this down to this commit which destroys the performance: > "block: Adjust cache sizes" (b6fef20c1215c6ef0004f6af4a9c4b77af51dc43) We could just revert this patch. I can't find any workload that gets faster with b6fef20c1215. It's rather the other way round. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox