Messages in this thread |  | | Date | Thu, 28 Dec 2000 13:42:44 -0800 | From | Tim Wright <> | Subject | Re: Abysmal RAID 0 performance on 2.4.0-test10 for IDE? |
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On Wed, Dec 27, 2000 at 04:23:43PM +0000, Paul Jakma wrote: > On Tue, 26 Dec 2000, Ian Stirling wrote: > > > The PCI bus can move around 130MB/sec, > > in bursts yes, but sustained data bandwidth of PCI is a lot lower, > maybe 30 to 50MB/s. And you won't get sustained RAID performance > > sustained PCI performance. >
No. A well-designed card and driver doing cache-line sized transfers can achieve ~100MB/s. On the IBM (Sequent) NUMA machines, we achieved in excess of 3GB/s sustained read I/O (database full table scan) on a 16-quad (32 PCI bus) system. That works out at around 100MB/s per bus.
Regards,
Tim
-- Tim Wright - timw@splhi.com or timw@aracnet.com or twright@us.ibm.com IBM Linux Technology Center, Beaverton, Oregon "Nobody ever said I was charming, they said "Rimmer, you're a git!"" RD VI - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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