From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.nokia.com ([192.100.122.233] helo=mgw-mx06.nokia.com) by bombadil.infradead.org with esmtps (Exim 4.68 #1 (Red Hat Linux)) id 1Jws53-00064j-6d for linux-mtd@lists.infradead.org; Fri, 16 May 2008 05:02:09 +0000 Subject: Re: [PATCH] NAND subpage read feature as a way to increase performance. Take 2. From: Artem Bityutskiy To: Alexey Korolev In-Reply-To: References: Content-Type: text/plain; charset=utf-8 Date: Fri, 16 May 2008 08:01:18 +0300 Message-Id: <1210914078.27243.13.camel@sauron> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Cc: dwmw2@infradead.org, joern@logfs.org, linux-mtd@lists.infradead.org, tglx@linutronix.de, hamish@cloud.net.au Reply-To: dedekind@infradead.org List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2008-05-15 at 17:23 +0100, Alexey Korolev wrote: > Hi,=20 >=20 > This patch enables NAND subpage read functionality.=20 > If upper layer drivers are requesting to read non page aligned data NAND > subpage-read functionality reads the only whose ECC regions which include > requested data when original code reads whole page. > This significantly improves performance in many cases.=20 >=20 > Here are some digits : >=20 > UBI volume mount time > No subpage reads: 5.75 seconds > Subpage read patch: 2.42 seconds >=20 > Open/stat time for files on JFFS2 volume: > No subpage read 0m 5.36s > Subpage read 0m 2.88s >=20 > Signed-off-by Alexey Korolev > ------------------------- Looks good to me, Acked-by Artem Bityutskiy Thanks! --=20 Best regards, Artem Bityutskiy (=D0=91=D0=B8=D1=82=D1=8E=D1=86=D0=BA=D0=B8=D0=B9 =D0=90= =D1=80=D1=82=D1=91=D0=BC)