I'm seeing very strange situation when try to send a lot of traffic (with netmap pkt-gen) from 82574L to 82574L NICs.
I'm using 13-CURRENT, with fc turned off (dev.em.X.fc=0). But still, `pkt-gen` can not send more packets per second than receiving side could process! When 82574L NIC sends to i210 NIC it could send much more than receiving side could process, and there are expected number of lost packets. But when receiving side is 82574L too, `pkt-gen -f tx` shows statisitcs like this: # pkt-gen -f tx -N -4 -i em1 -l 60 -R 744000 <skipped> ... 531.511259 main_thread [2464] 217104 pps (218624 pkts 104939520 bps in 1007000 usec) 429.52 avg_batch 99999 min_space 532.547259 main_thread [2464] 216958 pps (224768 pkts 107888640 bps in 1035999 usec) 426.50 avg_batch 99999 min_space 533.548256 main_thread [2464] 216872 pps (217088 pkts 104202240 bps in 1000998 usec) 426.50 avg_batch 99999 min_space ... 217104 pps instead of requested 744000! Generator could generate much more if I have, say, switch on other side. Is it limitation of 82574L or bug in driver? -- // Lev Serebryakov
signature.asc
Description: OpenPGP digital signature
