From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Zhang Subject: RE: raid0 low performance Date: Mon, 04 Jul 2005 20:26:56 -0400 Message-ID: <1120523217.5459.20.camel@localhost.localdomain> References: Reply-To: mingz@ele.uri.edu Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-n7HVKEHe8G1a5Zlh1tRr" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mark Hahn Cc: 'Linux RAID' List-Id: linux-raid.ids --=-n7HVKEHe8G1a5Zlh1tRr Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Mon, 2005-07-04 at 20:13 -0400, Mark Hahn wrote: > > # ./lspci -vv -d 11ab: > > 02:01.0 Class 0100: 11ab:5081 (rev 03) > > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- > > ParErr- Stepping- SERR- FastB2B- > > Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=3Dmedium >TAbo= rt- > > SERR- > Latency: 32, cache line size 08 >=20 > latency 32 is quite low; this parameter effects how long the device > can hold onto the bus. try > setpci -s 02:01.0 latency_timer=3D80 thanks a lot for this and i will test it tomorrow. > and see whether it improves things. I'm unclear on whether a bridged dev= ice > also needs the bridge's latency setting changed. >=20 > > Latency: 32, cache line size 08 >=20 > also low. I'm guessing that your bios is tuned for desktop use - some au= dio > setups need low latency settings. >=20 yes, i guess so, the only drawback of this box is that i am using a entry level server box. so its chipset is quite weak and the setting i left as default. Ming --=-n7HVKEHe8G1a5Zlh1tRr 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) iD8DBQBCydPQSYbkL5BnVYoRAkviAJ0R3O/j+qpc4nICngNxVYNS5Eu6SgCfS2Og xLsXD+clgc95TSFhcgmPk1I= =J6SS -----END PGP SIGNATURE----- --=-n7HVKEHe8G1a5Zlh1tRr--