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Re: udelay

To: Kumba <>
Subject: Re: udelay
From: Geert Uytterhoeven <>
Date: Sat, 2 Aug 2003 14:01:48 +0200 (MEST)
Cc: Linux/MIPS Development <>
In-reply-to: <>
Original-recipient: rfc822;
On Fri, 1 Aug 2003, Kumba wrote:
> Pete Popov wrote:
> > Looks like the latest udelay in 2.4 is borked. Anyway else notice that
> > problem?  I did a 10 sec test: mdelay works, udelay is broken, at least
> > for the CPU and toolchain I'm using.
> What's one way of testing this brokeness?  I've been trying to find some 
> explanation for a bug of some sort in a cobalt RaQ2 in which the tulip 
> driver (eth0) just stops dead after several minutes of use.  One of the 
> notable features of the tulip driver patch needed to work on the RaQ2 
> adds a "udelay(1000)" into the tulip source.  Without it, the eth0 on 
> the RaQ2 is dead, so I wonder if these are related.
> If they are related, then this behavior has been slowly getting worse it 
> seems, as eth0 on the RaQ2 apparently has had smaller and smaller 
> amounts of time needed before the interface died.  2.4.18, it took most 
> of a day, by 2.4.21, it happens within seconds.

Any kernel messages (e.g. transmit timed out) from the tulip driver when it



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds

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