From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harald Hoyer Date: Tue, 25 May 2004 12:01:08 +0000 Subject: Re: Update on disk IO slowdown using udev Message-Id: <40B33584.7090400@redhat.com> MIME-Version: 1 Content-Type: multipart/mixed; boundary="------------enigB444C22B43575F46BE7D800F" List-Id: References: <20040525104659.GF26696@y-boda.hpc2n.umu.se> In-Reply-To: <20040525104659.GF26696@y-boda.hpc2n.umu.se> To: linux-hotplug@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigB444C22B43575F46BE7D800F Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Ake wrote: > To prove my point. > > reboot > > dd if=/rawdev/sdb of=/dev/null bs=8192k count=20 > 20+0 records in > 20+0 records out > 167772160 bytes transferred in 1.572609 seconds (106683964 bytes/sec) > > mount -t tmpfs tmpfs /tmpfsdev > mknod /tmpfsdev/sdb b 8 16 > dd if=/tmpfsdev/sdb of=/dev/null bs=8192k count=20 > 20+0 records in > 20+0 records out > 167772160 bytes transferred in 10.733471 seconds (15630746 bytes/sec) > > > There is no filesystem on this device so bonnie is no good. > > ido-i [/]# hdparm -Tt /rawdev/sdb > > /rawdev/sdb: > Timing buffer-cache reads: 2276 MB in 2.00 seconds = 1137.60 MB/sec > Timing buffered disk reads: 292 MB in 3.01 seconds = 97.15 MB/sec > > ido-i [/]# hdparm -Tt /tmpfsdev/sdb > > /tmpfsdev/sdb: > Timing buffer-cache reads: 2276 MB in 2.00 seconds = 1137.04 MB/sec > Timing buffered disk reads: 42 MB in 3.01 seconds = 13.94 MB/sec > > Ok... you got a point! very odd! --------------enigB444C22B43575F46BE7D800F Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFAszWJt7dFwsVXVUIRAgRcAKDTBQTUwvuO57b3suU8wqjL/J8xMQCgx9UO 1VNh+2rTiPQvg1d15l9Kd24= =o2Dd -----END PGP SIGNATURE----- --------------enigB444C22B43575F46BE7D800F-- ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel