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Re: Image scaling performance

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: Image scaling performance
Date: Thu, 26 Feb 2015 18:16:17 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.4.0

On 26.02.2015 18:10, Michael Zimmermann wrote:
Is there a way to create a performance profile so I can see what
exactly needs so much time? I don't have JTAG but maybe UART+GDB could
help with that.

Have a look at boot_time.
adding prints is kind of annoying :D

On Thu, Feb 26, 2015 at 5:44 PM, Vladimir 'φ-coder/phcoder' Serbinenko
<address@hidden> wrote:
On 25.02.2015 19:46, Michael Zimmermann wrote:

I'm still questioning the efficiency
math operations because on slow devices there are other bottlenecks of
the same kind(like de/compression).

That's pure speculation at that point. GRUB has 3 compression algorithms:
- minilzo. Has some divisions in parts which GRUB doesn't use. Those parts
are easily disablable and I'll just do so.
- gzip. Uses division only in zlib header check. I'll optimise it a little
but it's only one division in header check, not in compressed data body.
- xz. No divisions

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