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Message-ID: <20091026184835.GB26473@redhat.com> Date: Mon, 26 Oct 2009 20:48:35 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Rusty Russell <rusty@...tcorp.com.au> Cc: virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org, netdev@...r.kernel.org Subject: performance regression in virtio-net in 2.6.32-rc4 Hi! I noticed a performance regression in virtio net: going from 2.6.31 to 2.6.32-rc4 I see this, for guest to host communication: [mst@...k ~]$ ssh robin sh streamtest1 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.0.0.3 (11.0.0.3) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.20 7806.48 [mst@...k ~]$ ssh robin sh streamtest1 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.0.0.3 (11.0.0.3) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 6814.60 Note: I had to revert 48925e372f04f5e35fec6269127c62b2c71ab794, and I applied a patch virtio-pci: fix per-vq MSI-X request logic which fixes a bug introduced by f68d24082e22ccee3077d11aeb6dc5354f0ca7f1. Any tips on debugging this? -- MST -- 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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