On Thu, 12 Jul 2001 10:08:35 -0400 Mike Dresser <[EMAIL PROTECTED]> wrote:
> Mart van de Wege wrote: > > > Folks, > > > > A minor question, possibly OT: for some reason I'm getting a very low > > network throughput between my laptop and my desktop machine. I just > ran a > > test with netpipe-tcp, and the maximum speed is some 15Mbps. As I have > a > > 3Com 905C in the desktop box and a 3Com 574 PCMCIA card on the laptop > > (both are 10/100 NICs) I would have expected a bit more speed here. > Also, > > my laptop complains about dropped interrupts during the test, and a > quick > > look with ifconfig shows that it is having buffer overruns. Is this > > related? Anyone got a clue as to what is going on and how I can boost > my > > network performance? > > I haven't looked up the 3com 574, but is it PCMCIA or CardBus? If it's > PCMCIA(the older standard), that 15Mbps sounds quite reasonable. I have > a > Xircom 56K + 10/100 combo card in my laptop, that is pcmcia, and i top > out at > about 1600-1700kps. PCMCIA is limited to about 2 meg per second, if i > recall > correctly. My old SVEC 10/100 card had the same dropped interrupts as > what > you report, the Xircom is much faster and doesn't do that. > > From the PCMCIA howto > (http://www.linuxdoc.org/HOWTO/PCMCIA-HOWTO-4.html) > > 16-bit PCMCIA cards have a maximum performance of 1.5-2 MB/sec. > That > means that any 16-bit 100baseT card (i.e., any card that uses the > pcnet_cs, > 3c574_cs, > smc91c92_cs, or xirc2ps_cs driver) will never achieve full 100baseT > throughput. Only CardBus network adapters can fully exploit 100baseT > data > rates. > > Hope this helps, > That's exactly it! Thanks Mike, serves me right for not reading the *right* FM :) So does anyone know of a nice CardBus NIC that plays well with Debian? I did get a 3Com 575 with this machine as well, but couldn't get it to work on the first go, and a friend of mine needed a network card, so I sold it to him :( (I'll see if he wants to swap. AFAIK he runs a 10 Mb network at home). Mart -- Baby even the losers get lucky sometimes Even the losers keep a little bit of pride Tom Petty and The Heartbreakers - Even The Losers
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