linux-kernel - Re: Revert "gro: Fix legacy path napi_complete crash", (was: Re: Linux 2.6.29)

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Date:	Tue, 24 Mar 2009 20:19:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Robert Schwebel <r.schwebel@...gutronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frank Blaschka <blaschka@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernel@...gutronix.de
Subject: Re: Revert "gro: Fix legacy path napi_complete crash", (was: Re:
	Linux 2.6.29)


* Ingo Molnar <mingo@...e.hu> wrote:

> * Herbert Xu <herbert@...dor.apana.org.au> wrote:
> 
> > On Tue, Mar 24, 2009 at 04:47:17PM +0100, Ingo Molnar wrote:
> > > 
> > > test failure on one of the boxes, interface got stuck after ~100K 
> > > packets:
> > > 
> > > eth1      Link encap:Ethernet  HWaddr 00:13:D4:DC:41:12  
> > >           inet addr:10.0.1.13  Bcast:10.0.1.255  Mask:255.255.255.0
> > >           inet6 addr: fe80::213:d4ff:fedc:4112/64 Scope:Link
> > >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> > >           RX packets:22555 errors:0 dropped:0 overruns:0 frame:0
> > >           TX packets:1897 errors:0 dropped:0 overruns:0 carrier:0
> > >           collisions:0 txqueuelen:1000 
> > >           RX bytes:2435071 (2.3 MiB)  TX bytes:503790 (491.9 KiB)
> > >           Interrupt:11 Base address:0x4000 
> > 
> > What's the NIC and config on this one? If it's still using the 
> > legacy/netif_rx path, where GRO is off by default, this patch 
> > should make it exactly the same as with my original patch 
> > reverted.
> 
> Same forcedeth box i reported before. Config below. (note: if you 
> want to use it you need to run it through 'make oldconfig', with 
> all defaults accepted)

Hm, i justhad a test failure (hung interface) with this too.

I'll go back to the original straight revert of "303c6a0: gro: Fix 
legacy path napi_complete crash", and will test it overnight - to 
establish a baseline of stability again. (to make sure there are no 
other bugs interacting)

	Ingo
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