Re: 2.6 upgrade overall failure report

From: David S. Miller
Date: Fri Apr 29 2005 - 11:13:49 EST

On Fri, 29 Apr 2005 02:17:56 -0700
Andrew Morton <akpm@xxxxxxxx> wrote:

> > . There is still a memory leak trouble (probably in tigon3 driver since others
> > reported so on kernel mailing list, and tigon3 is not a geek hardware since
> > most nowdays lowend servers use either tigon3 or pro1000)
> Please send a report to David Miller and Jeff Garzik and cc netdev@xxxxxxxxxxx

This is the first I've ever heard of any such leak, more likely
the leak is in the networking code somewhere.

> > . Since 2.6.10, the TCP task does not work anymore with OSX (2 Mbps instead
> > of 60 Mbps on a 100 Mbps wire)
> Please send a full report to David Miller and cc netdev@xxxxxxxxxxxx
> Also please describe a simple way of reproducing this - I'll see if it
> happens here.

It only happens with OS-X and it has to do with how they handle the fast
path of TCP input. It's a known problem but no satisfatory solution
exists yet. When the fast path in OS-X TCP input is hit, they always
delay ACKs by a full 500ms, there isn't much Linux can do about broken
behavior like that.

We are thinking of possible workarounds, but this bug is very low priority
since it is really a MAC OS-X issue.

Anyways, I'm in Chicago until Monday so won't be able to look into anything
in detail until then.
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