From: Andi Kleen <ak@suse.de>
To: Lars Ellenberg <Lars.Ellenberg@linbit.com>,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] SOLVED: uml "ip header error" for large (fragmented) udp packets
Date: Tue, 12 Oct 2004 02:11:40 +0200 [thread overview]
Message-ID: <20041012001140.GB17340@wotan.suse.de> (raw)
In-Reply-To: <xneXIovOv53ZtptO+AU2uyI=lge@web.de>
> will assume they contain their original values. */
> : "=r" (sum), "=r" (iph), "=r" (ihl)
> - : "1" (iph), "2" (ihl)
> - : "memory");
> + : "1" (iph), "2" (ihl));
> return(sum);
> }
>
> =======================
That's reverted, right?
>
> that's all, folks. only a missing memory barrier.
>
> WTF :-/
This was fixed in mainline some time ago (several months probably more)
The problem only started with newer gccs that optimize more aggressively.
> original (in include/asm-i386/checksum.h) right away??
> there may be similar bugs hiding in various areas of uml...
Sounds like a good idea.
>
> Thanks for now,
> keep it going...
>
> btw,
> anyone wants to give me a hint how to tune it best?
> maybe how to up the mtu of the UML "nics"?
Don't go over 4K because the VM doesn't like >order 0 allocations
very much. But in general bigger is better.
-Andi
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next prev parent reply other threads:[~2004-10-12 0:18 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-03 2:36 [uml-devel] uml "ip header error" for large (fragmented) udp packets Lars Ellenberg
2004-10-03 15:11 ` BlaisorBlade
2004-10-03 19:29 ` Lars Ellenberg
2004-10-04 11:07 ` Gerd Knorr
2004-10-04 11:56 ` Henrik Nordstrom
2004-10-06 17:50 ` BlaisorBlade
2004-10-06 18:48 ` Lars Ellenberg
2004-10-06 20:35 ` Andi Kleen
2004-10-06 21:48 ` Lars Ellenberg
2004-10-07 18:41 ` BlaisorBlade
2004-10-07 18:41 ` BlaisorBlade
2004-10-07 20:24 ` Lars Ellenberg
2004-10-11 17:55 ` Lars Ellenberg
2004-10-12 0:03 ` [uml-devel] SOLVED: " Lars Ellenberg
2004-10-12 0:11 ` Andi Kleen [this message]
2004-10-12 1:10 ` BlaisorBlade
2004-10-12 1:53 ` Michael Richardson
2004-10-15 15:25 ` [uml-devel] larger MTU _does_ work Lars Ellenberg
2004-10-12 0:27 ` [uml-devel] SOLVED: uml "ip header error" for large (fragmented) udp packets BlaisorBlade
2004-10-12 14:00 ` Lars Ellenberg
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