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Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value f
From: |
Marcelo Tosatti |
Subject: |
Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation |
Date: |
Thu, 13 Aug 2015 19:16:50 -0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Aug 13, 2015 at 01:25:29AM +0000, Li, Liang Z wrote:
> Hi Paolo & Marcelo,
>
> Could please point out what issue the patch 317b0a6d8ba44e try to fix? I
> found in live migration the cpu_synchronize_all_states will be called twice,
> and it will take more than 1 ms sometimes. I try to do some optimization but
> lack the knowledge about the background.
What the code in 317b0a6d8ba44e requires is to retrieve the TSC value
from the kernel.
Perhaps you can trace kvm_arch_get_regs and look why its taking that
amount of time and what can be done to improve it.
- [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Li, Liang Z, 2015/08/12
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation,
Marcelo Tosatti <=
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Li, Liang Z, 2015/08/13
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcin Gibuła, 2015/08/14
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Li, Liang Z, 2015/08/14
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcin Gibuła, 2015/08/14
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Li, Liang Z, 2015/08/14
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcin Gibuła, 2015/08/14
- Re: [Qemu-devel] about the patch kvmclock Ensure proper env->tsc value for kvmclock_current_nsec calculation, Marcelo Tosatti, 2015/08/14