>-----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
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