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

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Date:	Wed, 03 Dec 2014 18:51:45 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	willemb@...gle.com
Subject: Re: [PATCH] net: less interrupt masking in NAPI

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 ?

Quite frankly this patch is not a stable candidate, as it was a
performance improvement, with some regressions in a couple of drivers.



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