netdev - Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e

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Date:	Wed, 6 Jun 2012 17:43:03 +0900
From:	Hiroaki SHIMODA <shimoda.hiroaki@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>,
	Denys Fedoryshchenko <denys@...p.net.lb>,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	davem@...emloft.net
Subject: Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86)
 and e1000e

On Wed, 06 Jun 2012 07:10:13 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:

> On Tue, 2012-05-29 at 23:25 +0900, Hiroaki SHIMODA wrote:
> 
> > If I understand the code and spec correctly, TX interrupts are
> > generated when TXDCTL.WTHRESH descriptors have been accumulated
> > and write backed.
> > 
> > I tentatively changed the TXDCTL.WTHRESH to 1, then it seems
> > that latency spikes are disappear.
> > 
> > drivers/net/ethernet/intel/e1000e/e1000.h
> > @@ -181,7 +181,7 @@ struct e1000_info;
> >  #define E1000_TXDCTL_DMA_BURST_ENABLE                          \
> >         (E1000_TXDCTL_GRAN | /* set descriptor granularity */  \
> >          E1000_TXDCTL_COUNT_DESC |                             \
> > -        (5 << 16) | /* wthresh must be +1 more than desired */\
> > +        (1 << 16) | /* wthresh must be +1 more than desired */\
> >          (1 << 8)  | /* hthresh */                             \
> >          0x1f)       /* pthresh */
> > 
> 
> 
> Was this patch officially submitted ?
> 
> Thanks !

Sorry for long delay. I'll post.
(I have no idea how to fix this problem as keeping TXDCTL.WTHRESH to 5)
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