Messages in this thread | | | Date | Mon, 29 Jan 2001 21:41:21 -0700 (MST) | From | Todd <> | Subject | Re: [ANNOUNCE] Dolphin PCI-SCI RPM Drivers 1.1-4 released |
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folx,
i must be missing something here. i'm not aware of a PCI bus that only supports 70 MBps but i am probably ignorant. this is why i was confused by jeff's performance numbers. 33MHz 32-bit PCI busses should do around 120MB/s (just do the math 33*32/8 allowing for some overhead of PCI bus negotiation), much greater than the numbers jeff is reporting. 66 MHz 64bit busses should do on the order of 500MB/s.
the performance numbers that jeff is reporting are not very impressive even for the slowest PCI bus. we're seeing 993 Mbps (124MB/s) using the alteon acenic gig-e cards on 32-bit cards on a 66MHz bus. i would expect to get somewhat slower on a 33MHz bus but not catastrophically so (certainly nothing as slow as 60MB/s or 480Mb/s).
what am i misunderstanding here?
todd
On Mon, 29 Jan 2001, Jeff V. Merkey wrote:
> Date: Mon, 29 Jan 2001 16:49:53 -0700 > From: Jeff V. Merkey <jmerkey@vger.timpanogas.org> > To: linux-kernel@vger.kernel.org > Cc: jmerkey@timpanogas.org > Subject: Re: [ANNOUNCE] Dolphin PCI-SCI RPM Drivers 1.1-4 released > > > Relative to some performance questions folks have asked, the SCI > adapters are limited by PCI bus speeds. If your system supports > 64-bit PCI you get much higher numbers. If you have a system > that supports 100+ Megabyte/second PCI throughput, the SCI > adapters will exploit it. > > This test was performed in on a 32-bit PCI system with a PCI bus > architecture that's limited to 70 MB/S. > > Jeff > > - > 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/ >
========================================================= Todd Underwood, todd@unm.edu
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