Messages in this thread | | | From | "Martin Eriksson" <> | Subject | Re: via-rhine and MMIO | Date | Mon, 29 Oct 2001 21:11:27 +0100 |
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----- Original Message ----- From: "Urban Widmark" <urban@teststation.com> To: "Martin Eriksson" <nitrax@giron.wox.org> Cc: <linux-kernel@vger.kernel.org> Sent: Monday, October 29, 2001 7:13 PM Subject: Re: via-rhine and MMIO
> On Mon, 29 Oct 2001, Martin Eriksson wrote: > > > I have done some changes to the via-rhine driver in 2.4.13 to be able to run > > with MMIO. I know it isn't really needed but I do it mainly for fun & > > learning. > > Any measurable performance difference?
I don't think so, it would be slightly less latency, but as via-rhine needs to copy the data anyway...
> > Any important changes from the driver that used to be on > http://www.cs.umu.se/~c97men/linux ? > (I have a copy of "v1.03a ME1.0 3/12/00")
Yes _I_ have matured a bit =) And the new driver does not choose between MMIO/PORTIO at runtime, because most other drivers seem to select this via CONFIG_ directives.
> > > > /* Reload the station address from the EEPROM. */ > > writeb(0x20, ioaddr + MACRegEEcsr); > > /* Typically 2 cycles to reload. */ > > for (i = 0; i < 150; i++) > > if (! (readb(ioaddr + MACRegEEcsr) & 0x20)) > > break; > > ... > > > > If I run this code when I'm using MMIO, I get a hardware adress of > > "ff:ff:ff:ff:ff:ff" instead of the right one (and everything craps up). But > > when I comment out this part all is fine. So what's it needed for anyway? > > It is needed on some cards when rebooting from some other OSes that power > down the card (eg vt6102 chips on win98). The writeb causes the chip > itself to reload the hardware address from eeprom. Perhaps it no longer > finds the eeprom and just reads 0xff from some unmapped memory space. > > Does it work to enable MMIO after the reset code?
I'll check that out, and if all works fine I'll release a patch. By the way, how *do* you measure network performance the best way? What I have done now is only to stress test the driver, by copying a 400MB file from my Windows machine to /dev/null and at the same time recieving a 400MB file over FTP from my Sun Sparc which is bridged on another via-rhine.
_____________________________________________________ | Martin Eriksson <nitrax@giron.wox.org> | MSc CSE student, department of Computing Science | Umeå University, Sweden
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