netdev - Re: [PATCH iproute2] htb: support 64bit rates

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Message-ID: <1384439578.28458.149.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 14 Nov 2013 06:32:58 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2] htb: support 64bit rates

On Thu, 2013-11-14 at 16:03 +0800, Yang Yingliang wrote:
> On 2013/11/13 22:21, Eric Dumazet wrote:
> > On Wed, 2013-11-13 at 17:11 +0800, Yang Yingliang wrote:
> >>> -	if (!buffer) buffer = opt.rate.rate / get_hz() + mtu;
> >>> -	if (!cbuffer) cbuffer = opt.ceil.rate / get_hz() + mtu;
> >>> +	if (!buffer)
> >>> +		buffer = rate64 / get_hz() + mtu;
> >>> +	if (!cbuffer)
> >>> +		cbuffer = ceil64 / get_hz() + mtu;
> >>
> >> Hi,
> >> It may overflow here if rate64 and mtu are big enough.
> > 
> > Not really.
> > 
> > get_hz() on current kernels is really huge : 1000000000
> 
> Yeah, in normal condition, it won't happen.
> If user make a wrong input, such as "rate 0x800000000Gbit",
> Overflow happens. Although it has no impact on the value of the "opt.buffer".
> If it's better to have a judgement of the buffer's value. :)

Oh well, I can see you never really used HTB on high rates.

I'll send a v2 so that you can feel better ;)



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