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Message-ID: <CAA93jw49WSxU1tATiB1nQJRLvwHXJOaHq2t_1+Kp-Eb9FzS=rA@mail.gmail.com>
Date:	Mon, 2 Jan 2012 22:56:27 +0100
From:	Dave Taht <dave.taht@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCH] sch_qfq: fix overflow in qfq_update_start()

On Mon, Jan 2, 2012 at 10:45 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le lundi 02 janvier 2012 à 16:47 +0100, Eric Dumazet a écrit :
>> grp->slot_shift is between 22 and 41, so using 32bit wide variables is
>> probably a typo.
>>
>> This could explain QFQ hangs Dave reported to me, after 2^23 packets ?
>>
>> (23 = 64 - 41)
>>
>> Reported-by: Dave Taht <dave.taht@...il.com>
>> CC: Stephen Hemminger <shemminger@...tta.com>
>> CC: Dave Taht <dave.taht@...il.com>
>
> Oh well, I forgot my SOB :(
>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>
> David please just tell me if you prefer me to resend it
>
>

I figure I'm the wrong david, but I'll be testing the QFQ patch overnight.
I have tested it for about an hour thus far.

Your SFQ patch, posted earlier today, does bring SFQ and QFQ back
into equivalence at 10 iperfs.

http://www.teklibre.com/~d/bloat/sfqnewvsqfq10iperfs.png

Well done.

-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
FR Tel: 0638645374
http://www.bufferbloat.net
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