netdev - Re: [PATCH] netpoll: trapping fix/cleanup

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Date:	Wed, 04 Apr 2007 17:03:54 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	netdev@...r.kernel.org, shemminger@...ux-foundation.org,
	mhuth@...sta.com, kgdb-bugreport@...ts.sourceforge.net,
	mpm@...enic.com
Subject: Re: [PATCH] netpoll: trapping fix/cleanup

Hello.

Jeff Garzik wrote:

>> CONFIG_NETPOLL_TRAP causes the TX queue controls to be completely 
>> bypassed in
>> the netpoll's "trapped" mode which easily causes overflows in the 
>> drivers with
>> short TX queues (most notably, in 8139too with its 4-deep queue).
>> Make this option more sensible by only bypassing TX softirq wakeup and 
>> remove
>> CONFIG_NETPOLL_RX option completely since there is *no* code depending 
>> on it.

>> Signed-off-by: Sergei Shtylyov <sshtylyov@...mvista.com>

> ACK but (a) DaveM not me should apply this,

    Oops, sorry. But he's only mentioned as IPv4/v6 maintainer. :-)

> and (b) I would check with 
> netpoll people to see what that define  is there for.

    Amit Kale and I were already asking about CONFIG_NETPOLL_TRAP here 1+ 
months ago and got no replies. Well I'll try to CC Matt Mackall...
    If you mean CONFIG_NETPOLL_RX, there was #ifdef's in the early version of 
netpoll support:

http://git.kernel.org/?p=linux/kernel/git/tglx/history.git;a=commitdiff;h=8fb9cf8ab6c0ccb1b17b32c05dc9da3cc96ac229

but later they were removed but the option left:	

http://git.kernel.org/?p=linux/kernel/git/tglx/history.git;a=commitdiff;h=e3c265bcf67f21d847e970e71504890f61f37824

>     Jeff

WBR, Sergei
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