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| From: | Avi Kivity |
| Subject: | Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? |
| Date: | Wed, 04 Aug 2010 19:48:58 +0300 |
| User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.7) Gecko/20100720 Fedora/3.1.1-1.fc13 Thunderbird/3.1.1 |
On 08/04/2010 07:08 PM, Gleb Natapov wrote:
After applying cache fix nothing definite as far as I remember (I ran it last time almost 2 week ago, need to rerun). Code always go through emulator now and check direction flags to update SI/DI accordingly. Emulator is a big switch and it calls various callbacks that may also slow things down.
We can have it set up a fast path. Similar to how real hardware optimizes 'rep movs' to copy complete cachelines.
The emulator does all the checks, sets up a callback to be called on completion or when an interrupt is made pending, and lets x86.c do all the work.
-- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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