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Re: [FW-1] AW: [FW-1] Solaris vs. Linux for performance of VPN communicati on
Greetings!
Guangcheng Wen wrote:
I am not sure how much of my Linux's system bus is. How to know it?
PCI:
64bit vs. 32bit - identifyable simply by looking at. The 32bit are the
"normal" PCI busses, whereas the 64bit are nearly double size.
33MHz vs. 66MHz - for this you'll have to look at the specs of your
motherboard.
Simple multiplication yields bus' maximum theoretical upper
transferlimit - you'll have to subtract protocol overhead. So we get
~1 Gbit/s 32bit/33MHz (Standard PCI)
~2 Gbit/s 64bit/33MHz or 32bit/66MHz
~4 Gbit/s 64bit/66MHz
That's the limit for the PCI bus - which is not the only bottleneck in a
system's architecture. Most Sun machines (workgroup and medium range
servers) with the new Blade backplane only have a 1,2Gbit/s bus between
the PCI controller and the 9.6Gbit/s backplane, seriously limiting their
value as high-throughput firewalls, even if you try to optimize PCI bus
utilization (e.g. only one Gbit/s card per PCI bus).
Bye
Volker Tanger
IT-Security Consulting
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IBM
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