From: Kirill Batuzov <batuzovk@ispras.ru>
To: Blue Swirl <blauwirbel@gmail.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] Speedup 'tb_find_slow' by using the same heuristic as during memory page lookup
Date: Sun, 05 Dec 2010 10:14:44 +0300 [thread overview]
Message-ID: <4CFB3BE4.1090505@ispras.ru> (raw)
In-Reply-To: <AANLkTi=COsAhoMAOvUBAaXC86_JP4y6MvJ9onPSi3TiY@mail.gmail.com>
On 04.12.2010 23:11, Blue Swirl wrote:
> On Thu, Dec 2, 2010 at 1:12 PM, Kirill Batuzov<batuzovk@ispras.ru> wrote:
>> Move the last found TB to the head of the list so it will be found more quickly next time it will be looked for.
>>
>> Signed-off-by: Kirill Batuzov<batuzovk@ispras.ru>
>> Signed-off-by: Pavel Yushchenko<pau@ispras.ru>
>> ---
>>
>> This patch appeared during investigation of performance issues with
>> S5PC110 emulation for Samsung. It increses OS startup speed significantly.
>
> The patch looks reasonable, but I didn't see any visible difference in
> my tests. Could you report your numbers?
The exact numbers depend on complexity of guest system.
- For basic Debian system (no X-server) on versatilepb we observed 25%
decrease of boot time.
- For to-be released Samsung LIMO platform on S5PC110 board we
observed 2x (for older version) and 3x (for newer version) decrease of
boot time.
- Small CPU-intensive benchmarks are not affected because they are
completely handled by 'tb_find_fast'.
We also noticed better response time for heavyweight GUI applications,
but I do not know how to measure it accurately.
----
Kirill.
next prev parent reply other threads:[~2010-12-05 7:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-02 13:12 [Qemu-devel] [PATCH] Speedup 'tb_find_slow' by using the same heuristic as during memory page lookup Kirill Batuzov
2010-12-04 20:11 ` Blue Swirl
2010-12-05 7:14 ` Kirill Batuzov [this message]
2010-12-05 8:22 ` Blue Swirl
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