From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Zhang Subject: Re: raid0 low performance Date: Fri, 01 Jul 2005 08:41:03 -0400 Message-ID: <1120221664.5507.25.camel@localhost.localdomain> References: <1120184148.5521.21.camel@localhost.localdomain> <42C4AA31.8040307@dtbb.net> <50513.168.91.5.7.1120186660.squirrel@localhost> Reply-To: mingz@ele.uri.edu Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-FkLP+zqjyHi8j5Y1mmxu" Return-path: In-Reply-To: <50513.168.91.5.7.1120186660.squirrel@localhost> Sender: linux-raid-owner@vger.kernel.org To: John Madden Cc: Tyler , Linux RAID List-Id: linux-raid.ids --=-FkLP+zqjyHi8j5Y1mmxu Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Thu, 2005-06-30 at 21:57 -0500, John Madden wrote: > > useage during the tests? even PCI 32bit, 33mhz should be able to hit > > 133 Mbytes per second I believe. What are you writing *from* ? dev/zer= o >=20 > ~127MB/s is the theoretical bus speed of PCI/33. Actual throughput is mu= ch less > than that, of course. >=20 > But you're not on a 33MHz bus, you should be at at least 66MHz (and info = in /proc which one? i can not find. :P could u tell me? thx > should tell you). Given the lack of performance increase though, I'm gue= ssing > you're either pegging the bus or the CPU, not yet the throughput of the k= ernel > itself. Does the program block in disk wait when running? yes, it write synchronously. so it is wait. but my friend run same code on a 3ware 4 disk raid0 and get 140MB easily. similar box, P4 2.8G 1G ram. supermicro board. >=20 > John >=20 > (Go Rams) >=20 >=20 >=20 --=-FkLP+zqjyHi8j5Y1mmxu Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQBCxTnfSYbkL5BnVYoRAt5kAJ4r1i7mUee3jkISxQdPDZ2urt4JtgCfXV00 Aj5urWVujGWYBfFW201YJYU= =gy45 -----END PGP SIGNATURE----- --=-FkLP+zqjyHi8j5Y1mmxu--