Messages in this thread |  | | Date | Sun, 25 Aug 2002 22:39:11 +0200 | From | Vojtech Pavlik <> | Subject | Re: 2.4 and 2.5 Problem ne.c driver |
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On Sun, Aug 25, 2002 at 07:58:32PM +0200, Christophe Devalquenaire wrote:
> Donald Becker wrote: > > > > On Sun, 25 Aug 2002, Christophe Devalquenaire wrote: > > > kris wrote: > > > > kris wrote: > > > > > > > > > > I have 2 ne2000 isa cards (10Mbps for each) and with this versions of > > > > > kernel the bandwith is divided by 2. So 2*5Mbps = 10Mbps instead of > > > > > 2*10Mbps=20Mbps. > > > > > I try to fix the pbm. > > > > > > > > perhaps a bug exists on the dispatcher when 2 identical cards exist. > > > > Anyone have 2 identical cards for test ? > > > > > > After other tries, the ne.c file is buggy. Confirmation. > > > I investigate. Anyone helps me ? > > > > Do you have evidence of a specific problem? > > Or the same hardware running faster with other drivers or kernel versions? > > > > This sounds as if you are just running out of ISA bus bandwidth... > > My configuration : a server with 2 cards NE2000(10 Mbps), a machine with > 2 cards : 1 NE2000(ISA) and 1 3C905b(PCI). > server : NE2000 <-> workstation : NE2000 in 192.168.1.X > server : NE2000 <-> workstation : 3C905b in 192.168.0.X > > I try with a 2.4.6, 2.4.15, and 2.5.31. there is near from no > differences in the code of ne.c, gkrellm tells me that when I download > on both cards big files (for tests), the bandwidth falls to 5Mbps for > each card. > If 1 download stops, the other bandwidth is up to 10Mbps immediatly. > > No other ISA card is used on the server.
ISA has a maximum bandwidth usually about a megabyte per second in PIO (io-port, which the NE2k uses) mode. That's 10MBps. With two cards, i gets evenly distributed. What's so surprising here?
-- Vojtech Pavlik SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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