netdev - Re: [PATCH] net: less interrupt masking in NAPI

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Message-ID: <547FD077.4060807@huawei.com>
Date:	Thu, 4 Dec 2014 11:09:43 +0800
From:	Yang Yingliang <yangyingliang@...wei.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>,
	<willemb@...gle.com>
Subject: Re: [PATCH] net: less interrupt masking in NAPI

On 2014/12/4 10:51, Eric Dumazet wrote:
> On Thu, 2014-12-04 at 10:10 +0800, Yang Yingliang wrote:
>> On 2014/12/3 19:52, Eric Dumazet wrote:
>>> On Wed, 2014-12-03 at 17:26 +0800, Yang Yingliang wrote:
>>>
>>>> Before this patch, when a large network flow arrives, some other processes
>>>> response slowly or even don't response because the cpu is dealing with softirq.
>>>>
>>>> After this patch, under pressure, much more softirq is doing in ksoftirqd. The other
>>>> processes be scheduled.
>>>>
>>>> My system has dual core.
>>>
>>> Which NIC driver are you using ?
>>>
>> The driver we developed ourself, it's not upstreamed.
> 
> Is it a NAPI driver ?
Yes.
> 
> Quite frankly this patch is not a stable candidate, as it was a
> performance improvement, with some regressions in a couple of drivers.
> 
OK, thanks for your reply.


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