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

[Toddandmargo-n]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1458121

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

Status in QEMU:
  New

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1458121/+subscriptions