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Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelera
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator |
Date: |
Wed, 5 Oct 2016 09:21:55 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 |
On 05/10/2016 03:13, Michael S. Tsirkin wrote:
> On Tue, Oct 04, 2016 at 07:16:49PM +0200, Paolo Bonzini wrote:
>>
>>
>> On 04/10/2016 16:18, Thomas Huth wrote:
>>>>>>> Using only tcg has also some disadvantages: For some tests, it's
>>>>>>> interesting to know whether they also work properly with KVM (e.g.
>>>>>>> migration tests), and only using tcg by default slows down the "make
>>>>>>> check" quite a bit - which might become an issue now that we're adding
>>>>>>> more and more tests.
>>>>>
>>>>> Which tests are you seeing a slow-down for ?
>>> Well, everything that is using accel=tcg in tests/ could be accelerated.
>>> For example, the new ipv6/ppc64 unit test is quite slow with TCG:
>>>
>>> sudo QTEST_QEMU_BINARY=ppc64-softmmu/qemu-system-ppc64 time tests/pxe-test
>>>
>>> 48.46user 0.07system 0:48.48elapsed
>>
>> Could that point to a firmware bug? 10 network-bound seconds for a boot
>> makes some sense, but 10 CPU-bound seconds don't...
>
> AFAIK pxe firmware typically can't handle interrupts
> so it polls for packets.
Still wouldn't be appreciably slower when emulating.
Paolo
- [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, (continued)
- [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Laurent Vivier, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Daniel P. Berrange, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Thomas Huth, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Daniel P. Berrange, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Thomas Huth, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Michael S. Tsirkin, 2016/10/04
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Thomas Huth, 2016/10/05
- Re: [Qemu-devel] [PATCH 1/2] accel: allows to select the "best" accelerator, Paolo Bonzini, 2016/10/05
[Qemu-devel] [PATCH 2/2] tests: use accel=best instead of accel=kvm:tcg, Laurent Vivier, 2016/10/04
Re: [Qemu-devel] [PATCH 0/2] introduce "accel=best", Laurent Vivier, 2016/10/04
Re: [Qemu-devel] [PATCH 0/2] introduce "accel=best", Andrew Jones, 2016/10/04