[Bloat] Jumbo frames and LAN buffers

[Dave Taht]

On Mon, May 16, 2011 at 7:42 AM, Kevin Gross <kevin.gross at avanw.com> wrote:

> I would like to try this. Can you suggest specific equipment to look at.
> Due
> to integration and low port count, most of the cheap consumer stuff has
> surprisingly good layer-2 performance. I've tested a bunch of Linksys and
> other small/medium business 5 to 24 port gigabit switches. Since I measure
> latency, I expect I would have noticed if flow control were kicking in.
>

I would certainly appreciate more people looking at the switch in the
wndr3700v2 we're using on the bismark project.

I'm seeing some pretty deep buffering on it

>
> Kevin Gross
>
> -----Original Message-----
> From: bloat-bounces at lists.bufferbloat.net
> [mailto:bloat-bounces at lists.bufferbloat.net] On Behalf Of Jim Gettys
> Sent: Monday, May 16, 2011 7:23 AM
> To: bloat at lists.bufferbloat.net
> Subject: Re: [Bloat] Jumbo frames and LAN buffers
>
> On 05/16/2011 09:15 AM, Kevin Gross wrote:
> > All the stand-alone switches I've looked at recently either do not
> support
> > 802.3x or support it in the (desireable) manner described in the last
> > paragraph of the linked blog post. I don't believe Ethernet flow control
> is
> > a factor in current LANs. I'd be interested to know the specifics if
> anyone
> > sees it differently.
>
> Heh.  Plug wireshark into current off the shelf cheap consumer switches
> intended for the home.  You won't like what you see.  And you have no
> way to manage them.  I was quite surprised last fall when doing my home
> experiments to see 802.3 frames; I had been blissfully unaware of its
> existence, and had to go read up on it as a result.
>
> I don't think any of the enterprise switches are so brain damaged.  So i
> suspect it's mostly lurking to cause trouble in home and small office
> environments, exactly where no-one will know what's going on.
>                         - Jim
>
>
>
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-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com
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