netdev - Re: [Linux-ATM-General] [PATCH] atm/br2684: netif_stop_queue() when atm device busy and netif_wake

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Date:	Thu, 10 Sep 2009 23:30:44 +0200
From:	Karl Hiramoto <karl@...amoto.org>
To:	"Philip A. Prindeville" <philipp_subx@...fish-solutions.com>
Cc:	netdev@...r.kernel.org, linux-atm-general@...ts.sourceforge.net
Subject: Re: [Linux-ATM-General] [PATCH] atm/br2684: netif_stop_queue() when
 atm	device busy and netif_wake_queue() when we can send packets again.

Philip A. Prindeville wrote:
> I had noticed that with my Solos card, and using Qwest 7062/896kb/s
> service that I was typically only getting ~400kb/s upstream, so I
> thought that delayed transmitter restarts might be the culprit and
> decided to try out this patch.
>
> I'm running 2.6.27.26, and I modified the patch as below.
>
> Has anyone confirmed this patch (Karl's) against 2.6.27?
>
> Thanks,
>
> -Philip
I'd be interested in hearing comparisons with/without the patch.    What 
i have is no upstream packet loss with this patch, however slightly 
lower total throughput.  I think because the upper networking layers 
take time to restart the packet flow.   I'm not really sure if or how 
many packets to upper layers buffer.  I haven't had time to debug it 
further.

I don't have a solos card, but you may have to tweak the solos driver 
sk_sndbuf  value.

--
Karl
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