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

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Date:	Fri, 11 Sep 2009 12:56:59 -0700
From:	"Philip A. Prindeville" <philipp_subx@...fish-solutions.com>
To:	Karl Hiramoto <karl@...amoto.org>
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.

Karl Hiramoto wrote:
> 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

I'm running with the patch right now...  Can't tell if latency has been affected.

Seems to be working a bit better, but I've not done any formalized testing.

-Philip

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