Q: 64-bit PCI - 66 Mhz vs 33 Mhz networking performance?
Pedro Díaz Jiménez
pdiaz88 at terra.es
Tue Jul 3 18:47:02 PDT 2001
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On Tuesday 03 July 2001 22:20, Patrick Geoffray wrote:
> Hi Wes,
>
> W Bauske wrote:
> > That's interesting. Do you by chance have numbers for ServerWorks
> > and say, a 32bit PCI config? Just curious how bad 150MB/sec is.
> > For what I do, that would be more than enough.
>
> You need to keep in mind the (theor.) peak of the PCI bus :
> * 32 bits/33 Mhz : aggregated ideal peak at 132 MB/s
> * 64 bits/33 Mhz : aggregated ideal peak at 264 MB/s
> * 64 bits/66 Mhz : aggregated ideal peak at 528 MB/s
>
> On a Intel 440GX 32/33 :
> ================================
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 1st: 8 pages from bogus sdma pg, 8 to bogus rdma
> bus_read (send) = 128 MBytes/s
> bus_write (recv) = 128 MBytes/s
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 2nd: sdma a page, rdma a page 8 times
> bus_read (send) = 128 MBytes/s
> bus_write (recv) = 128 MBytes/s
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 3rd: sdma and rdma to/from alternating pages (coarse grain)
> bus_read (send) = 128 MBytes/s
> bus_write (recv) = 128 MBytes/s
>
> DMA rate for 4096 Byte transfers (32bit / 33MHz bus)
> 4th: sdma and rdma to/from alternating pages (fine grain)
> bus_read (send) = 128 MBytes/s
> bus_write (recv) = 128 MBytes/s
>
> => that's good (Intel chipsets are not bad for 32/33)
>
>
> On ServerWorks 64/66 (LE):
> ==========================
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 1st: 8 pages from bogus sdma pg, 8 to bogus rdma
> bus_read (send) = 455 MBytes/s
> bus_write (recv) = 512 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 2nd: sdma a page, rdma a page 8 times
> bus_read (send) = 455 MBytes/s
> bus_write (recv) = 512 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 3rd: sdma and rdma to/from alternating pages (coarse grain)
> bus_read (send) = 455 MBytes/s
> bus_write (recv) = 512 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 4th: sdma and rdma to/from alternating pages (fine grain)
> bus_read (send) = 455 MBytes/s
> bus_write (recv) = 512 MBytes/s
>
> => Well, compare it to the i860. But be carefull, some ServerWorks
> chipsets are not so good.
> For example the HE-LE (64/66) :
> ================================
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 1st: 8 pages from bogus sdma pg, 8 to bogus rdma
> bus_read (send) = 315 MBytes/s
> bus_write (recv) = 372 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 2nd: sdma a page, rdma a page 8 times
> bus_read (send) = 315 MBytes/s
> bus_write (recv) = 372 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 3rd: sdma and rdma to/from alternating pages (coarse grain)
> bus_read (send) = 315 MBytes/s
> bus_write (recv) = 372 MBytes/s
>
> DMA rate for 4096 Byte transfers (64bit / 66MHz bus)
> 4th: sdma and rdma to/from alternating pages (fine grain)
> bus_read (send) = 315 MBytes/s
> bus_write (recv) = 372 MBytes/s
>
>
> The best way to choose a machine is to bench the PCI bus before
> to buy, ask from a loan from the vendor.
>
> A good idea would be to collect PCI performances from different
> motherboards (and different chipsets) and put them on a website
> to help people to make their choice. If someone has some free
> time...
I have the space, the bandwitch and maybe the time. Do you think
planetcluster.org, hardware section, is a good site?
Any volunteers for collecting the data?
Regards
Pedro
>
> -----------------------------------------------------------
>
> | Patrick Geoffray, Ph.D. patrick at myri.com |
> | Myricom, Inc. http://www.myri.com |
> | Cell: 865-389-8852 325 N. Santa Anita Ave. |
> | Fax: 865-974-1950 Arcadia, CA 91006 |
>
> -----------------------------------------------------------
>
>
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__________________________________________________
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| Pedro Diaz Jimenez |
| |
| pdiaz88 at terra.es pdiaz at acm.asoc.fi.upm.es |
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| http://planetcluster.org |
| Clustering & H.P.C. news and documentation |
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| There are no stupid questions, but there's a lot |
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