netdev - Re: [PATCH net v5 2/2] net: sched: htb: fix calculation of quantum

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Date:	Fri, 6 Dec 2013 10:36:26 +0800
From:	Yang Yingliang <yangyingliang@...wei.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>,
	<brouer@...hat.com>, <jpirko@...hat.com>, <jbrouer@...hat.com>
Subject: Re: [PATCH net v5 2/2] net: sched: htb: fix calculation of quantum

On 2013/12/5 20:18, Eric Dumazet wrote:
> On Thu, 2013-12-05 at 15:10 +0800, Yang Yingliang wrote:
>>  	if (!cl->level) {
>> -		cl->quantum = hopt->rate.rate / q->rate2quantum;
>> +		u64 quantum = div64_u64(cl->rate.rate_bytes_ps,
>> +					q->rate2quantum);
> 
> 		q->rate2quantum being 32bit, prefer the following :
> 
> 		u64 quantum = cl->rate.rate_bytes_ps;
> 
> 		do_div(quantum, q->rate2quantum);
> 
> 		Since it maps to better assembly code on 32bit arches.

Change it in v6, thanks!

Regards,
Yang


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