On 05/24/2010 11:07 PM, Neo Jia wrote:
hi, I am using KVM/Qemu to debug my Windows guest according to KVM wiki page (http://www.linux-kvm.org/page/WindowsGuestDrivers/GuestDebugging). It works for me and also I can only use one Windows guest and bind its serial port to a TCP port and run "Virtual Serial Ports Emulator" on my Windows dev machine. The problem is that these kind of connection is really slow. Is there any known issue with KVM serial port driver? There is a good discussion about the same issue one year ago. Not sure if there is any improvement or not after that.
How slow? Can you measure it (without a debugger, just guest-to-guest file transfer)?
slirp used to be ridiculously slow but some recent change made it fairly fast. Probably a missing wakeup, perhaps serial has the same problem. In any case I recommend testing with qemu-kvm.git master.
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