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Re: Sudden slowdown of ARM emulation in master

From: Philippe Mathieu-Daudé
Subject: Re: Sudden slowdown of ARM emulation in master
Date: Wed, 26 Feb 2020 09:44:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/26/20 9:41 AM, Peter Maydell wrote:
On Tue, 25 Feb 2020 at 23:08, Niek Linnenbank <address@hidden> wrote:

Just now I was working on some small fixes for the cubieboard machine and 
rebasing my Allwinner H3 branches.
While doing some testing, I noticed that suddenly the machines were much slower 
than before.
I only see this happening when I rebase to this commit:
    ca6155c0f2bd39b4b4162533be401c98bd960820 ("Merge tag 'patchew/address@hidden' of 
https://github.com/patchew-project/qemu into HEAD")

Yeah, I noticed a slowdown yesterday as well, but haven't tracked it down
as yet. The first thing would be to do a git bisect to try to narrow
down what commit caused it.

My guess: biggest chunk of memory is the DRAM, registered as "fast RAM" by QEMU, but the SoCs provide SRAM which is supposed to be faster. Not anymore with QEMU. And Linux try to use the SRAM when possible.

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