Messages in this thread |  | | Date | Thu, 22 Nov 2001 11:15:05 +0100 | From | Martin Knoblauch <> | Subject | Re: Tuning Linux for high-speed disk subsystems |
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> Re: Tuning Linux for high-speed disk subsystems > > > > As I count your disks may be the double for the best case. I read here on > > LKML a post that someone claims that W2k deliever 250 MB/s with such a > > configuration. Linux 2.4 should do the same. Ask the SCSI gurus. > > > > That may have been my post you refer to. With 2x5 disks, each capable of > 50 MB/s by itself, we can stream 255 MB/s very smoothly in either direction > with W2K --- as long as FILE_FLAG_NOBUFFER is used. With standard > reads the number is more like 100 MB/s if I recall correctly, so the buffer > cache can definitely get in the way. > > With Linux + XFS I was getting 250 MB/s read and 220 MB/s write (with a > bit less smoothness than W2K) using O_DIRECT and no high mem to avoid > bounce buffer copies. Using standard reads the numbers drop to around > 120 MB/s. That was a couple of weeks ago and I want to try tweaking some > more but a co-worker has "borrowed" pieces of the hardware for the moment. > Marvin,
could you elaborate a bit more :-), or point me/us to your post (couldn't find it). We are currently evaluating solutions for doing HDTV playback for one of our customers. This will need about 300-320 MB/sec read. We know (at least someone claims so) that you can do it with SGI equipment at a price. The goal for the customer is to definitely beat that price :-))
Martin -- ------------------------------------------------------------------ Martin Knoblauch | email: Martin.Knoblauch@TeraPort.de TeraPort GmbH | Phone: +49-89-510857-309 C+ITS | Fax: +49-89-510857-111 http://www.teraport.de | Mobile: +49-170-4904759 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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