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Re: [Qemu-devel] [PATCH] tcg/softmmu: Increase size of TLB caches
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH] tcg/softmmu: Increase size of TLB caches |
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Date: |
Wed, 6 Sep 2017 01:26:54 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 |
On 09/05/2017 05:33 PM, Pranith Kumar wrote:
>> This significantly degrades performance of alpha-softmmu.
>> It spends about 25% of all cpu time in memset.
>
> What workload does it degrade for? I will try to reproduce and see
> which memset is causing this.
emerge --update --ask @world
which is a lot of python, iirc.
It is the tlb flush memset that is causing this.
The tlb has grown from a few kB to 300kB with your patch.
r~