Re: bin/50638: Extreme slowness on loading gzipped kernels on old CPUs

To: gnats-bugs%NetBSD.org@localhost
Subject: Re: bin/50638: Extreme slowness on loading gzipped kernels on old CPUs
From: Joerg Sonnenberger <joerg%britannica.bec.de@localhost>
Date: Sun, 10 Jan 2016 19:06:39 +0100

On Sun, Jan 10, 2016 at 05:40:00PM +0000, Izumi Tsutsui wrote:
> (1) leave as is and use the dumb crc32() function (for small binary)
> (2) pull "DYNAMIC_CRC_TABLE" implementation from zlib into libkern/crc32.c
> (3) completely disable gunzip crc32() calculation in cread() function

Another option would be to use a version of what libarchive is using in
src/external/bsd/libarchive/dist/libarchive/archive_crc32.h. That
version is still pretty small.

Joerg

References:
- bin/50638: Extreme slowness on loading gzipped kernels on old CPUs
  - From: Izumi Tsutsui

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