Aurelien Jarno a écrit : > Paolo Bonzini a écrit : >> On 02/08/2011 12:15 PM, Aurelien Jarno wrote: >>> however >>> it should not be done ignoring all the*current* drawbacks of the >>> iothread mode. We know them (at least for some of them), so let's try to >>> solve them. >> Let's also enumerate them. >> > > From what I know: > - performance regression in TCG mode
I setup an x86_64 guest on an x86_64 host (Intel Xeon E5345). Nothing was running except the standard daemons and the CPU governor was set to "performance" on all CPU. I then compared the network performance using netperf in default mode, through a tap interface and a virtio nic. I got the following results (quite reproducible, std below 0.5): - without IO thread: 107.36 MB/s - with IO thread: 89.93 MB/s I haven't redone the tests I have done two weeks ago on MIPS, ARM, PowerPC and SH4 (using different emulated network cards: smc91c111, rtl8139, e1000, virtio), but it was roughly the same slow down, except on ARM where it was more important. -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurel...@aurel32.net http://www.aurel32.net
