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

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Date:	Sun, 09 Mar 2014 06:39:46 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ming Chen <v.mingchen@...il.com>
Cc:	netdev@...r.kernel.org, Erez Zadok <ezk@....cs.sunysb.edu>,
	Dean Hildebrand <dhildeb@...ibm.com>,
	Geoff Kuenning <geoff@...hmc.edu>
Subject: Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are
 enabled

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.


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