a sniffer program, usually 'top' shows cpu usage is about 6%
when I add the below trivial code, cpu usage jump to 86%!
vtune analysis result:(lightweight hotspot)
void dummyprocessPacket(char *packeT0
{ int i; for (i=0;i<800;i++) cpu time:66.878s { int s = 86400+i; 38.765s
int j=s+2345; 122.333s } //other normal processing
}
the call stack is:
void packet_capture()
{
while (1)
{
if (packet_recv(fd)>0) //received
dummyprocesspacket();
}
}
bottom-up:
packet_capture ----0.389s
dummyProcessPacket----229.577s
memcpy ....0.141s
any idea to solve this problem,will the 'top'be not accurate?
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