From mboxrd@z Thu Jan 1 00:00:00 1970 From: Petr Sebor Subject: Re: sata_via - too slow Date: Tue, 03 Aug 2004 00:22:01 +0200 Sender: linux-ide-owner@vger.kernel.org Message-ID: <410EBE89.9000008@scssoft.com> References: <410E2E9C.8020606@scssoft.com> <410EC673.1090506@clanhk.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigE40A0BDB6390ABA736B2B574" Return-path: Received: from fe-cecom-sitel1.supernetwork.cz ([81.31.3.242]:14720 "EHLO lindik.prosek.czf") by vger.kernel.org with ESMTP id S264192AbUHBWWP (ORCPT ); Mon, 2 Aug 2004 18:22:15 -0400 In-Reply-To: <410EC673.1090506@clanhk.org> List-Id: linux-ide@vger.kernel.org To: "J. Ryan Earl" Cc: linux-ide@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigE40A0BDB6390ABA736B2B574 Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 7bit J. Ryan Earl wrote: > Petr Sebor wrote: > >> and it is being worse, I can see frequently, that the 'wait' gets >> frequently over 90%. >> I have tried the kernel both in SMP or UP, with noacpi, iommu=off, >> preemptible kernel or not >> without difference.... > > > Which 86_64.org patches are you using? None. It is vanilla 2.6.7 kernel with 2.6.8-rc2-bkX patch. I'd try to patch the kernel with x86_64.org's stuff, but I thought this applies only if I run the kernel in native - 64bit mode. I haven't gotten that far... The kernel is compiled with K7 Athlon CPU optimizations, nothing more. > >> >> From what I have understood, these drives are SATA with PATA bridge >> on them. >> The problems described happen on both. No difference. >> >> Interesting is, that >> root@opteron:$ hdparm -t /dev/sda >> >> /dev/sda: >> Timing buffered disk reads: 144 MB in 3.03 seconds = 47.45 MB/sec >> >> So it is not _that_ slow... > > > I highly doubt it's related to libata or sata_via at all. A high wait > indicates your processors handle data a lot faster than your > harddrives can deliver and processes are blocked waiting on I/O, it > would otherwise be counted as idle time in the 2.4 line; this is > normal AFAIK. Your performance is nominal, the problem is most likely > elsewhere. The more I naively think about it the more I am getting the similar feeling. I fear I have incorrectly blamed the sata layer, but I don't remember having similar problems with ide drives. > What motherboard is this? The MSI FAR2 whatever? It is MSI Master2-FAR.. sorry for not mentioning that. Petr --------------enigE40A0BDB6390ABA736B2B574 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 (MingW32) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFBDr6Xir6eWjmOQ6cRAhDCAJ91pckAlKCFkbwYIKfzeHP3kn1qQACfekcU RV83tFNSTyKiOStR1Z6tJdY= =xT/f -----END PGP SIGNATURE----- --------------enigE40A0BDB6390ABA736B2B574--