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Message-ID: <1368091063.12413.9.camel@cr0> Date: Thu, 09 May 2013 17:17:43 +0800 From: Cong Wang <amwang@...hat.com> To: netdev@...r.kernel.org Cc: "David S. Miller" <davem@...emloft.net> Subject: Re: Regression: too many packets with incorrect checksum On Thu, 2013-05-09 at 16:36 +0800, Cong Wang wrote: > > Running another RHEL6 KVM guest, it doesn't have this problem, so it is > not related with KVM environment. I thought it might be due to tcpdump receives a packet which is checksummed partially while the wire receives a correct one, but netperf shows that is wrong, apparently it hurts performance: With latest -net: ~% netperf -4 -H 192.168.122.74 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.74 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.20 105.19 With a RHEL6 kernel: ~% netperf -4 -H 192.168.122.101 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.101 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 5528.64 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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