netdev - Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are enabled

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Date:	Sun, 09 Mar 2014 18:31:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	v.mingchen@...il.com, netdev@...r.kernel.org,
	ezk@....cs.sunysb.edu, dhildeb@...ibm.com, geoff@...hmc.edu
Subject: Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are
 enabled

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sun, 09 Mar 2014 06:39:46 -0700

> On Sun, 2014-03-09 at 01:47 -0500, Ming Chen wrote:
> 
>> Thanks for the patch. I forgot to mention that excessively big cwnd
>> (or bufferbloat) does play a part in Hash-Cast. We found that using
>> TCP Vegas does not show unfairness even in the presence of hash
>> collision among TCP flows. Comparing Vegas and Cubic, we found that
>> Vegas has a much smaller cwnd.
> 
> Of course, Vegas is delay based. It does not need to increase cwnd to
> insane values.
> 
> Problem is it does not compete well in presence of non Vegas flows.
> 
> And unfortunately, Internet is filled by non Vegas flows.

Vegas also does not respond quickly enough to sudden increases in
available bandwidth.
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