netdev - Re: [RFC PATCH] sched: Fix resource limiting in pfifo

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Message-Id: <20090830.221959.172193969.davem@davemloft.net>
Date:	Sun, 30 Aug 2009 22:19:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	krkumar2@...ibm.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] sched: Fix resource limiting in pfifo_fast

From: Krishna Kumar <krkumar2@...ibm.com>
Date: Sun, 30 Aug 2009 11:53:44 +0530

> From: Krishna Kumar <krkumar2@...ibm.com>
> 
> pfifo_fast_enqueue has this check:
>         if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) {
> 
> which allows each band to enqueue upto tx_queue_len skbs for a
> total of 3*tx_queue_len skbs. I am not sure if this was the
> intention of limiting in qdisc.
> 
> Patch compiled and 32 simultaneous netperf testing ran fine. Also:
> # tc -s qdisc show dev eth2
> qdisc pfifo_fast 0: root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 16835026752 bytes 373116 pkt (dropped 0, overlimits 0 requeues 25) 
>  rate 0bit 0pps backlog 0b 0p requeues 25 
> 
> (I am taking next week off, so sorry for any delay in responding)
> 
> Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>

This is probably just a thinko, nice catch.

I think I'll apply this to net-next-2.6, thanks!
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