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回復 69# wyhpower
貴lan card的throughput唔會比onbroad蟹LAN高. 我手頭上有張Intel 1000PT PCI-E LAN,所以先會插入去用,但用落同以前用onbroad realtek lan無咩分別,even用gigalan去share file,都完全feel唔到有分別,無論速度,穩定性及CPU USAGE.
所以請不要神化LAN CARD. 除非你有DUAL PORT LAN又唔同玩法

vodaben

你用一張onbroad同蟹Card / PT desktop比ge, 就無咩分別
如果係同Server adapter好似PT server, 甘就有分別
onbroad通常都會好用小小CPU ultilization, 如果長期B野, utilization就會高
Server LAN有Processor(好似叫NPU) , 可以減低CPU工作量, 就好似Display Card硬解甘
不過其實依家分別都唔大, 不過呢個世界上係有人為0.000001%效能去比$1xxx買lan card架, 我係其中一個

akg

no data no talk

(點會所有lan card throughput 一樣 )

JackWu

no data no talk  

(點會所有lan card throughput 一樣  )
akg 發表於 2010-5-14 10:56

os/ Driver好影響, 睇你點setup喇.

kenfung

no data no talk  

(點會所有lan card throughput 一樣  )
akg 發表於 2010-5-14 10:56

   Set Data 好似舊左少少喎~

stephenwong

no data no talk  

(點會所有lan card throughput 一樣  )
akg 發表於 2010-5-14 10:56

If you use the latest kernel, no matter what NIC, you get >90% throughput on the wire, even with a PCI 64bit bus.  The effect of the kernel is much bigger than the relative performance of the NIC brandname.  TCP checksum calculation, now, almost all brandnames have it.  Ring buffers for receive and transmit, either you have some on board RAM (like Broadcom), or you can allocate some system RAM.

I heard that for multicast address filter, there is a difference between brandnames, some are implemented better, and some are less efficient.  But, how many users are using multicast in normal office / home work?

PCI 32-bit is not very good for GbE, because of bandwidth limitation on the PCI bus, other than that, not much difference.

Stephen Wong @ Hong Kong

akg

very difficult to find new benchmark test results

but my point is that it is impossible that all lan cards have the same throughput, even if the OS, kernal, driver etc are the same.

Otherwise, everybody should buy Realtek lan cards and let Intel go to hell.

Set Data 好似舊左少少喎~
kenfung 發表於 2010-5-14 15:03

JackWu

very difficult to find new benchmark test results

but my point is that it is impossible that ...
akg 發表於 2010-5-14 15:49

係有分別, 但近代系統, 軟件性能提升已經令佢地實質效能貼近.
事實上亦唔係每個kernel/driver都會對intel/broadcom chip支援得好.
典型例子就係 FreeBSD 7.x kernel內置的bge core驅動Broadcom 5721性能極差.
而intel em, igb, realtek re GbE chipset就效能極接近.

kenfung

係有分別, 但近代系統, 軟件性能提升已經令佢地實質效能貼近.
事實上亦唔係每個kernel/driver都會對intel ...
JackWu 發表於 2010-5-14 16:14

看來 JackWu 對FreeBSD 很有研究~

kenfung

very difficult to find new benchmark test results

but my point is that it is impossible that ...
akg 發表於 2010-5-14 15:49

就算係同牌子但不同型號既nic 都會有分別..
只不過而家討論既問題係..以家用角度..在現代的電腦上..
onboard nic 同 intel , broadcom 同的差距..已經不如以前般大..
特別現代無論係軟件同硬件既配合..家用差別更少...所以用以前的數據去睇..就不太適合了

可以說的在家用角度...是沒有多大分別..