netdev - Re: [PATCH] net_sched: fix dequeuer fairness

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Message-ID: <1309102334.5134.31.camel@mojatatu>
Date:	Sun, 26 Jun 2011 11:32:14 -0400
From:	jamal <hadi@...erus.ca>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net_sched: fix dequeuer fairness

On Sun, 2011-06-26 at 17:09 +0200, Eric Dumazet wrote:

> I would just remove the jiffies break, now we have a 64 packets limit...
> 
> if (quota >= work || need_resched()) {
> 	...
> }

Seems reasonable to do. Some stats (on two different machines
at least with dummy) on a system with low # of processes:
~80% of the time - we exit the loop because of packet quota
~1% for both need_resched and jiffy
~19% simply because there were less than quota packets

Note: we do use a jiffy check on net_rx_action() but i suspect
we never ever hit it.

cheers,
jamal

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