Veritas-bu

[Veritas-bu] Windows 2000 Gigabit Ethernet Poor Performance

2003-03-26 08:20:12
Subject: [Veritas-bu] Windows 2000 Gigabit Ethernet Poor Performance
From: Colin.Smith AT motorola DOT com (Smith Colin-WCCS07)
Date: Wed, 26 Mar 2003 13:20:12 -0000
>-----Original Message-----
>From: Michael E. Willard [mailto:mwillard AT soccour DOT com] 
>Sent: Tuesday, March 25, 2003 7:13 PM
>To: Veritas NBU List
>Subject: [Veritas-bu] Windows 2000 Gigabit Ethernet Poor Performance

>be a problem.  Also, what about the packet size, I have read 
>that you can increase the performance of the card by allowing 
>for jumbo packets???

Yes, you can.

It depends on the card though. A lot of gigabit adapters will only get 
300-400mps or so using the default ethernet MTU size of 1500. You can 
potentially double or triple the throughput of the card and reduce the CPU load 
by choosing the MTU carefully.

Here's an interesting performance evaluation, using Linux. I'd ignore the 
make/model information, it's also a syskonnect sales pitch:
http://www.syskonnect.com/syskonnect/performance/gig-over-copper.htm

However, it's worth considering routing and fragmentation if you're going to 
increase the MTU size on your gigabit ethernet adaptors, you'll see a 
performance hit if the packets are routing through 10/100mbit networks as the 
routers will have to break up the 9k packets into 1.5k standard ethernet 
packets. It may well be worth setting up a private non routed gigabit LAN 
between your servers with large 8-9k MTU sizes.

-- 
Colin Smith

<Prev in Thread] Current Thread [Next in Thread>