Re: Oracle Data Guard

From: Yong Huang <yong321_at_yahoo.com>
Date: Tue, 09 Dec 2003 11:59:24 -0800
Message-ID: <F001.005D9512.20031209115924@fatcity.com>

Jumbo frames are new to me. The Ethernet Definitive Guide book says it was proposed by one vendor and adopted by several, so may not have good interoperability. But I wonder how much performance improvement there is by going from MTU 1500 with SDU 8k to MTU 8k with SDU 8k. I assume the lower the OSI level, the faster assembling and disassembling those protocol data units is done.

Yong Huang

> With TCP over standard ethernet the maximum transfer unit (MTU) is about
> 1500 bytes, this means if you want to send 2000 bytes over network, you have
> to fragment it in 2 packets and send them separately. This means double
> packet headers, double latency etc. Jumbo frames is a capability of some
> Gbit ethernet cards which allow them to transfer about 9000 bytes in a
> single packet. SDU is session level transfer unit (session data unit). When
> you enable jumbo frames and set MTU/SDU to 8192 for example, you'll fit much
> more in single packet, thus increasing performance for larger transactions.

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Author: Yong Huang
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Received on Tue Dec 09 2003 - 13:59:24 CST