On 05/27/2012 08:08 AM, Ben Greear wrote:
On 05/26/2012 09:39 AM, Sujith Manoharan wrote:
With UDP, these are the numbers I get: Server: [ iperf -i1 -s -u -l 8K ] [ 3] 29.0-30.0 sec 38.9 MBytes 327 Mbits/sec 0.246 ms 10/ 4993 (0.2%) [ 3] 30.0-31.0 sec 38.6 MBytes 323 Mbits/sec 0.260 ms 34/ 4970 (0.68%) [ 3] 31.0-32.0 sec 39.3 MBytes 330 Mbits/sec 0.212 ms 14/ 5045 (0.28%) [ 3] 32.0-33.0 sec 37.2 MBytes 312 Mbits/sec 0.229 ms 15/ 4777 (0.31%) [ 3] 33.0-34.0 sec 39.0 MBytes 327 Mbits/sec 0.253 ms 13/ 5002 (0.26%)
We started testing with two AR9380 NICs today (one AP, the other STA). I applied Felix's skb optimization patch, and the ath9k memleak fix patch on top of 3.3.7+. When we generate traffic using a modified version of pktgen, the STA interface transmits at around 310Mbps for a minute or two, but then the system dies of OOM (and maybe worse..having trouble getting useful serial console log). It died much faster before Felix's two patches were applied. I disabled all of our network related buffer adjustments (ie, no longer increasing tcp_wmem, etc), and it still crashes. The system has 2GB RAM, but it is 32-bit kernel, so not all is available to the networking code... That said, the OOM killer kills VNC and such. Anyway, I'll try some memleak debugging to see if I can find any leaks. It seems to me that we should not actually OOM just by trying to transmit too fast on a station interface :P PS. If anyone knows how to make minicom ignore page refreshes so that it doesn't obscure the last bit of the crash log when BIOS starts up again, please let me know! Thanks, Ben -- Ben Greear <greearb@xxxxxxxxxxxxxxx> Candela Technologies Inc http://www.candelatech.com -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
