linux-kernel - Re: [net-next resend v4 5/7] tuntap: multiqueue support

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Message-ID: <509202D7.3090401@redhat.com>
Date:	Thu, 01 Nov 2012 13:04:23 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	David Miller <davem@...emloft.net>
CC:	mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, maxk@...lcomm.com,
	edumazet@...gle.com, krkumar2@...ibm.com,
	ernesto.martin@...sat.com, haixiao@...iper.net
Subject: Re: [net-next resend v4 5/7] tuntap: multiqueue support

On 11/01/2012 02:16 AM, David Miller wrote:
> From: Jason Wang <jasowang@...hat.com>
> Date: Mon, 29 Oct 2012 14:15:49 +0800
>
>> @@ -110,6 +110,11 @@ struct tap_filter {
>>   	unsigned char	addr[FLT_EXACT_COUNT][ETH_ALEN];
>>   };
>>   
>> +/* 1024 is probably a high enough limit: modern hypervisors seem to support on
>> + * the order of 100-200 CPUs so this leaves us some breathing space if we want
>> + * to match a queue per guest CPU. */
> Please don't format comments like this.  Put that final "*/" on it's
> own line.
>
> I'm really perplexed how you can get it right elsewhere in your
> patches, and then botch it up only in a few select locations :-/

Sorry about this, some parts were copy paste from the comments of 
reviewer. I will post a new version to fix them all.
>> +/* We try to identify a flow through its rxhash first. The reason that
>> + * we do not check rxq no. is becuase some cards(e.g 82599), chooses
>> + * the rxq based on the txq where the last packet of the flow comes. As
>> + * the userspace application move between processors, we may get a
>> + * different rxq no. here. If we could not get rxhash, then we would
>> + * hope the rxq no. may help here.
>> + */
> For example, this one is done right.
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