Re: 3c515 issue
Donald Becker <[email protected]> Wed, 2 Oct 2002 09:53:14 -0400 (EDT)
| Newsgroups | gmane.linux.drivers.3c509.devel |
|---|---|
| Message-ID | <[email protected]> |
On Tue, 1 Oct 2002, Wm. G. McGrath wrote: > On Tue, 1 Oct 2002 02:37:40 -0400 (EDT) > Donald Becker <[email protected]> wrote: > > "Uhmmm, this is a card on the ISA bus. At best you will get > "5.33MB/sec, and that is with 100% of the CPU time waiting for the > "ISA bus and no dropped packets. > > Out of curiosity, is this with both half and full duplex? Yes. > Obviously, not faster than > 8MByte/sec - the theoretical bus speed maximum. Most ISA busses run at 8MHz and require three or more cycles per 16 bit transfer. The "8MB/sec" number usually comes from people misinterpreting "8MHz". [[ With some motherboard chipsets you can run the ISA bus with 2 cycle transfers, but that's a hack and most ISA cards will not work. ]] -- Donald Becker [email protected] Scyld Computing Corporation http://www.scyld.com 410 Severn Ave. Suite 210 Second Generation Beowulf Clusters Annapolis MD 21403 410-990-9993