Hello Xiaohui, On Fri, 2010-08-06 at 17:23 +0800, xiaohui.xin@xxxxxxxxx wrote: > Our goal is to improve the bandwidth and reduce the CPU usage. > Exact performance data will be provided later. Have you had any performance data to share here? I tested my experimental macvtap zero copy for TX only. The performance I have seen as below without any tuning, (default setting): Before: netperf 16K message size results with 60 secs run is 7.5Gb/s over ixgbe 10GbE card. perf top shows: 2103.00 12.9% copy_user_generic_string 1541.00 9.4% handle_tx 1490.00 9.1% _raw_spin_unlock_irqrestore 1361.00 8.3% _raw_spin_lock_irqsave 1288.00 7.9% _raw_spin_lock 924.00 5.7% vhost_worker After: netperf results with 60 secs run is 8.1Gb/s, perf output: 1093.00 9.9% _raw_spin_unlock_irqrestore 1048.00 9.5% handle_tx 934.00 8.5% _raw_spin_lock_irqsave 864.00 7.9% _raw_spin_lock 644.00 5.9% vhost_worker 387.00 3.5% use_mm I am still working on collecting more data (latency, cpu utilization...). I will let you know once I get all data for macvtap TX zero copy. Also I found some vhost performance regression on the new kernel with tuning. I used to get 9.4Gb/s, now I couldn't get it. Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
