netdev - Re: [RFC PATCH v2 0/9] bql: Byte Queue Limits

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Message-ID: <CA+mtBx8nyODqV155J0kUtfFQW3gy9O9pKKXZuwCN+nSqiijX6A@mail.gmail.com>
Date:	Thu, 25 Aug 2011 08:19:29 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	jhs@...atatu.com
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [RFC PATCH v2 0/9] bql: Byte Queue Limits

> For wired connections I think the big deal is in improved
> runtime memory saving (your perf numbers are kinda ok).
> The challenge is going to be with wireless where the underlying
> bandwidth changes (and therefore the optimal queue size varies
> more frequently). The problem with active queue management is
> getting the feedback loop to be more accurate and i think there
> will be challenges with wired devices.

The important characteristic (for us at least) will be reduced latency
for high priority packets (for NICs that don't support qos multiQ.  I
do have data showing those benefits, but it's a little old.  I will
have something to present at LPC.

> I notice that you dont have any wireless devices;
> but it would be nice for someone to check this out on wireless.
> CCing Johannes - maybe he has some insight.
>
Yeah, these scare me ;-)

> cheers,
> jamal
>
>
>
>
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