Messages in this thread | | | Subject | odd behavior with r8169 and pcap | From | Terry Griffin <> | Date | Mon, 29 Nov 2004 10:11:49 -0800 |
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Hi all,
I'm seeing some very strange behavior with the r8169 driver in 2.6.9. (Also observed in FC2's 2.6.5-1).
Throughput is generally dog slow, less than 100Mb/s. But if I fire up any libpcap-based monitoring utility (ethereal, iftop, etc) the throughput suddenly jumps an order of magnitude to near 1Gb/s. As soon as I quit from the monitoring utility the throughput drops back back to where it was before. This can be repeated over an over.
I created a dummy libpcap monitoring program (below). This is enough to trigger the behavior.
So the obvious questions are: Is this a known problem? Why the heck does it do this? Is there a fix or workaround to get the high rate all the time other than running a pcap utility 24x7?
Thanks, Terry Griffin
-- dummy-monitor.c -----------------
#include <pcap.h> #define CAPTURE_LENGTH 68
void null_handler(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data) { }
int main( int argc, char *argv[] ) { char *iface; pcap_t* pd; char errbuf[PCAP_ERRBUF_SIZE];
if( argc == 1 ) iface = "eth0"; else iface = argv[1];
pd = pcap_open_live(iface,CAPTURE_LENGTH,0,1000,errbuf); pcap_loop(pd,-1,(pcap_handler)null_handler,NULL);
return 0; }
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