netdev - Re: [V2 RFC net-next PATCH 2/2] virtio_net: export more statistics through ethtool

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Message-ID: <4FD1728E.20802@redhat.com>
Date:	Fri, 08 Jun 2012 11:33:34 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	Rick Jones <rick.jones2@...com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, mst@...hat.com
Subject: Re: [V2 RFC net-next PATCH 2/2] virtio_net: export more statistics
 through ethtool

On 06/08/2012 04:56 AM, Ben Hutchings wrote:
> On Thu, 2012-06-07 at 13:39 -0700, Rick Jones wrote:
>> On 06/07/2012 01:24 PM, Ben Hutchings wrote:
>>> On Thu, 2012-06-07 at 13:05 -0700, David Miller wrote:
>>>> From: Ben Hutchings<bhutchings@...arflare.com>
>>>> Date: Thu, 7 Jun 2012 18:15:06 +0100
>>>>
>>>>> I would really like to see some sort of convention for presenting
>>>>> per-queue statistics through ethtool.  At the moment we have a complete
>>>>> mess of different formats:
>>>> Indeed.  Probably ${QUEUE_TYPE}-${INDEX}-${STATISTIC} is best.
>>>> With an agreed upon list of queue types such as "rx", "tx", "rxtx"
>>>> etc.
>>> I think we should leave the type names open-ended, as there are other
>>> useful groupings like per-virtual-port.  In that case the separator
>>> should be chosen to allow arbitrary type names without ambiguity.
>> So you mean like something along the lines of the presence of say '.'
>> indicating indent a level:
>>
>> rx_bytes:  1234
>>       myqueue1.rx_bytes: 234
>>       myqueue2.rx_bytes: 345
>>       ...
> Most drivers seem to want this sort of ordering/grouping:
>
> group0.foo
> group0.bar
> ...
> group1.foo
> group1.bar
> ...
>
> but if we have a standard way of indicating groups of statistics then
> the user can choose whether they want to reorder by type name.
>
> Ben.
>

Yes, it looks to me that the per-queue satistics were better:

- Simple and less synchronization.
- Good for future virtio-net multiqueue merging.
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