Date: Fri, 08 Feb 2008 17:17:51 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Dominic Fandrey <kamikaze@bsdforen.de> Cc: "Carlos A. M. dos Santos" <unixmania@gmail.com>, freebsd-stable@freebsd.org Subject: Re: RELENG_7: interrupt eating whole cpu core Message-ID: <1202491071.2126.42.camel@localhost> In-Reply-To: <47AC7FF6.1020801@bsdforen.de> References: <47A9F835.1060200@bsdforen.de> <47AA0696.5020109@bsdforen.de> <7872AB6E-21DA-4E2D-93C0-D07CFA3A7E47@mac.com> <47AA0E3E.4020304@bsdforen.de> <e71790db0802071822l661bdcb8s6dfe5b94be11f0dc@mail.gmail.com> <47ABF66E.4040807@bsdforen.de> <e71790db0802080543g54d27bb8nfdc33e342f982b4@mail.gmail.com> <1202485501.2126.34.camel@localhost> <47AC7FF6.1020801@bsdforen.de>
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--=-14vnf+Nq/tk3ELyiINLM Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Fri, 2008-02-08 at 17:14 +0100, Dominic Fandrey wrote: > Tom Evans wrote: > > If I try to turn on DMA, I just get WDMA2, which just doesn't cut it: >=20 > I think any DMA mode is fast enough to handle a DVD drive. There's just n= o=20 > necessity for more. >=20 WDMA is not UDMA. Any UDMA variant would be enough. WDMA2 provides a maximum of 16MiB/s, which will frequently lead to buffer underruns viewing a DVD. UDMA2 provides a maximum of 33MiB/s, which IS plenty. > >> # atacontrol mode acd0 udma5 > > current mode =3D WDMA2 >=20 > Same as for me. I'm satisfied with the speed of the drive. I'm rarely satisfied - I'm quite often not bothered enough to pursue :) Tom --=-14vnf+Nq/tk3ELyiINLM Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBHrI64lcRvFfyds/cRArc5AJ9gLTJ55RUTP5E2ghd76RLBSloleACfcksw MP64ram49FYhtHN1zNR2O/M= =VqbW -----END PGP SIGNATURE----- --=-14vnf+Nq/tk3ELyiINLM--
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