Hello all
I have done a TCP performance using ttcp tool. Test network
environment is 100Mb/s(100Mb/s switch, 100Mb/s netcard).
Two P4 PCs, one CPU is 2.8GHZ, the other CPU is 2.6GHZ.
In my test model, 2.8GHZ is server, 2.6GHZ is client. During the
test, I recorded the CPU idle value. When packet size varies, the 2 PCs
CPU idle value varies differently. See the following table.
PacketSize(Bytes) Server(2.8GHZ)CPU idle (%) Client(2.6GHZ)CPU
idle(%)
16 16 48
32 52 69
64 74 81
128 82 84
256 86 87
512 88 90
1024 90 89
2048 91 90
4096 92 89
8192 92 90
When packt size is small, server CPU idle is less than client
CPU idle, When paket size is big, server CPU idle is more than client
CPU idle. If UDP replaces TCP, the test result is same.
(Nagle is not turned off. In fact, I found the Nagle can't be
turned on)
Who can the reason?
Best Regards
Lu
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