[132468] in North American Network Operators' Group
Re: Jumbo frame Question
daemon@ATHENA.MIT.EDU (Wil Schultz)
Thu Nov 25 19:33:40 2010
In-Reply-To: <20101126001926.GB28110@skywalker.creative.net.au>
From: Wil Schultz <wschultz@bsdboy.com>
Date: Thu, 25 Nov 2010 16:33:29 -0800
To: Adrian Chadd <adrian@creative.net.au>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
This helps tons.=20
speedguide.net has some registry 'tweeks' for different versions of windows.=
=20
Also Win7 had the ability to turn on a FASTTCP type of congestion management=
called Compound TCP. I haven't tried the windows version so ymmv, but I hav=
e experienced great success by changing the congestion avoidance algorithm o=
n other devices.=20
-wil
On Nov 25, 2010, at 4:19 PM, Adrian Chadd <adrian@creative.net.au> wrote:
> TCP maximum window sizes.
>=20
> Application socket buffer sizes.
>=20
> Fix those and re-test!
>=20
>=20
>=20
> Adrian
>=20
> On Fri, Nov 26, 2010, Harris Hui wrote:
>>=20
>>=20
>> Hi
>>=20
>> Does anyone have experience on design / implementing the Jumbo frame
>> enabled network?
>>=20
>> I am working on a project to better utilize a fiber link across east coas=
t
>> and west coast with the Juniper devices.
>>=20
>> Based on the default TCP windows in Linux / Windows and the latency betwe=
en
>> east coast and west coast (~80ms) and the default MTU size 1500, the
>> maximum throughput of a single TCP session is around ~3Mbps but it is too=
>> slow for us to backing-up the huge amount of data across 2 sites.
>>=20
>> The following is the topology that we are using right now.
>>=20
>> Host A NIC (MTU 9000) <--- GigLAN ---> (MTU 9216) Juniper EX4200 (MTU 921=
6)
>> <---GigLAN ---> (MTU 9018) J-6350 cluster A (MTU 9018) <--- fiber link
>> across site ---> (MTU 9018) J-6350 cluster B (MTU 9018) <--- GigLAN --->
>> (MTU 9216) Juniper EX4200 (MTU 9216) <---GigLAN ---> (MTU 9000) NIC - Hos=
t
>> B
>>=20
>> I was trying to test the connectivity from Host A to the J-6350 cluster A=
>> by using ICMP-Ping with size 8000 and DF bit set but it was failed to pin=
g.
>>=20
>> Does anyone have experience on it? please advise.
>>=20
>> Thanks :-)
> --=20
> - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid Supp=
ort -
> - $24/pm+GST entry-level VPSes w/ capped bandwidth charges available in WA=
-
>=20
