Re: [RFT] kvm with Windows optimization

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

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Avi Kivity wrote:
> Anthony Liguori wrote:
>>>
>>>> static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
>>>> {
>>>>     int r;
>>>>
>>>>     kvm_mmu_free_some_pages(vcpu);
>>>>     r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache,
>>>>                    pte_chain_cache, 4);
>>>>     if (r)
>>>>         goto out;
>>>>     r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache,
>>>>                    rmap_desc_cache, 1);
>>>>     if (r)
>>>>         goto out;
>>>>     r = mmu_topup_memory_cache_page(&vcpu->mmu_page_cache, 8);
>>>>     if (r)
>>>>         goto out;
>>>>     r = mmu_topup_memory_cache(&vcpu->mmu_page_header_cache,
>>>>                    mmu_page_header_cache, 4);
>>>> out:
>>>>     return r;
>>>> }
>>>
>>>
>>> These are the (4, 1, 8, 4) values in the call to 
>>> mmu_topup_memory_cache.  Perhaps one of them is too low.
>>
>> Sure.  Would this be affected at all by your tpr patch?  

Using the following patch, I'm getting really good results.  I'll keep 
running test cases tonight and see if I can trigger anything.

Windows is *much* faster with your patch, very nice work!

Regards,

Anthony Liguori

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Subject: [PATCH][TPR OPT] Increase rmap_desc_cache
From: Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>

Using kvm-test to replay the second stage of a WinXP Pro install, I can
reliably trigger a BUG_ON() in the mmu.  It usually happens during the first
run.

With this patch applied, I've been able to replay the install for the past few
hours (probably 10 or so installs) without hitting the BUG_ON().

Signed-off-by: Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

--- a/kernel/mmu.c	2007-10-25 12:36:18.000000000 -0500
+++ b/kernel/mmu.c	2007-10-25 17:09:55.000000000 -0500
@@ -280,7 +280,7 @@
 	if (r)
 		goto out;
 	r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache,
-				   rmap_desc_cache, 1);
+				   rmap_desc_cache, 2);
 	if (r)
 		goto out;
 	r = mmu_topup_memory_cache_page(&vcpu->mmu_page_cache, 8);

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