Mark McLoughlin wrote:
Hey,The main patch in this series is 5/6 - it just kills off the virtio_net tx mitigation timer and does all the tx I/O in the I/O thread. Below are the results I got from benchmarking guest->host and host->guest on my machine. There's enough numbers there to make anyone blind, but basically there are results for current kvm-userspace.git, with the no-tx-timer patch applied and with the drop-the-mutex patch applied. Also, I've included results that show what difference some tuning makes with all the patches applied. The tuning basically just involves pinning the I/O thread and the netperf/netserver processes in both the host and guest to two physical CPUs which share a L2 cache. (Yes, the 1k buffer size results are weird - we think there's a bug in recent kernels that causes us not to coalesce these small buffers into a large GSO packet before sending) Anyway, the results in all their glory: | guest->host tput | host->guest tput netperf, 10x20s runs (Gb/s) | min/ mean/ max/stddev | min/ mean/ max/stddev ------------------------------+----------------------------+--------------------------- kvm-userspace.git, 1k | 0.600/ 0.645/ 0.670/ 0.025 | 5.170/ 5.285/ 5.470/ 0.087 kvm-userspace.git, 16k | 3.070/ 3.350/ 3.710/ 0.248 | 5.950/ 6.374/ 6.760/ 0.261 kvm-userspace.git, 65k | 4.950/ 6.041/ 7.170/ 0.639 | 5.480/ 5.642/ 5.810/ 0.092 no tx timer, 1k | 0.720/ 0.790/ 0.850/ 0.040 | 4.950/ 5.172/ 5.370/ 0.128 no tx timer, 16k | 4.120/ 4.512/ 4.740/ 0.190 | 4.900/ 5.480/ 6.230/ 0.416 no tx timer, 65k | 5.510/ 7.702/ 9.600/ 1.153 | 4.490/ 5.208/ 5.690/ 0.408
Okay, I don't see 3/6 yet, but does no tx timer mean just no tx timer or no tx timer + handling IO in the IO thread?
Regards, Anthony Liguori -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
