[Qemu-devel] [Bug 1458121] Re: USB2 is five times slower than native on qemu-kvm

[Michael Tokarev]

That version was a pre-alfa version of kvm support in qemu, is insanely
outdated, is heavily patched by redhat. I don't even think USB2 was
supported by that version. Please try on a current version of qemu and
kernel and reopen if the problem persist there.

** Changed in: qemu
       Status: New => Invalid

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Title:
  USB2 is five times slower than native on qemu-kvm

Status in QEMU:
  Invalid

Bug description:
  Dear Qemu,

  Spice told me to report this over here.

  Scientific Linux 6.6

  $ uname -r
  2.6.32-504.16.2.el6.x86_64

  $ cat /etc/redhat-release
  Scientific Linux release 6.6 (Carbon)

  $ rpm -qa qemu\*
  qemu-img-0.12.1.2-2.448.el6_6.3.x86_64
  qemu-kvm-0.12.1.2-2.448.el6_6.3.x86_64

  
  I have a bootable USB2 FC21 flash drive.  I can boot my machine directly from 
it or run it as a virtual machine through KVM.

  Problem: it is about 5 times slower through KVM.  (Really, I am not
  exaggerating)

  Many thanks,
  -T

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