Re: BMAC stuff - what I have

-- forwarded message --

Kernel version: any (2.2.x - 2.4.x)

Symptoms: high speed transfers from a macintosh with a BMAC network device are limited to less than 100kB/s and often corrupted.  Systems known to have this are some Wallstreets and beige Desktops.  10/100 chips in Lombard are BMAC+ which do not seem to have the bug.  This is a hardware bug that exists in some releases of the chip, and only effects Tx packets.

-- end of forwarded message --


I see the same problem on my Rev C iMac at 100 mb in both 2.2 and 2.4
kernels. I get slow transfers and broken scp's but not corrupted
data on complete transfers. Same machine works fine in MacOS and OSX.

Bob
--
Robert E. Brose II    N0QBJ
http://www.jriver.com/~bob/
bob@kunk.jriver.com

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On Sat, 10 Feb 2001 22:38:22 -0600 (CST), Robert E Brose II [off-list ref] wrote:

I see the same problem on my Rev C iMac at 100 mb in both 2.2 and 2.4
kernels. I get slow transfers and broken scp's but not corrupted
data on complete transfers. Same machine works fine in MacOS and OSX.

Bob

Thanks for the input.

If it is true that the iMac has the same Tx problem, since they have always used BMAC+ (AppleSpec: 10/100 on all iMacs), I guess that this would mean that BMAC+ can also have this bug.  Can any one confirm this with an additional case?

It seems rather erratic on which systems are afflicted.  My brother's lombard is not affected, nor a wallstreet confirmed built after mine, which is.

In anycase, enough talk.  Anyone know dbdma well enough to approach a fix? :)

--
Joseph P. Garcia
http://www.execpc.com/~jpgarcia

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let this be a lesson to me to be more vigalant in testing.  The patch posted earlier seems to work for me now. (2.4.2pre2)

smack me with a Bozo point or two.

--
Joseph P. Garcia
http://www.execpc.com/~jpgarcia

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On Sun, 11 Feb 2001 01:47:16 -0600, "Joseph P. Garcia" [off-list ref] wrote:

let this be a lesson to me to be more vigalant in testing.  The patch posted earlier seems to work for me now. (2.4.2pre2)

but now at home, the processor was loaded by the system for a bit, and ethernet doesn't seem to work nearly as well.  Friend has a switched hub, here I do not.

But this seems closer.

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Joseph P. Garcia
http://www.execpc.com/~jpgarcia

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"Joseph P. Garcia" wrote:

If it is true that the iMac has the same Tx problem,

Yes, they do.  That is why we started working on it.  I just
tracked down some of the info from Darwin, and had someone else
work on it for a while.

... Anyone know dbdma well enough to approach a fix? :)

Yeah, but I don't have the time right now.  It's on the list of
things to do, but it doesn't bother me enough to stop other things
and fix it.  Since you asked, I thought I would at least give you
what I had so you wouldn't have to start from zero :-).


	-- Dan

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"Joseph P. Garcia" wrote:
[snip]

It seems rather erratic on which systems are afflicted.  My brother's lombard
is not affected, nor a wallstreet confirmed built after mine, which is.

Just for your information: I acutally *have* this problem quite frequently with
my Lombard/333 when it is connected to a 100MBit switch. It seems to work when
conntected to 1 10MBit hub, though.

Yours, Albrecht.


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