Date: Thu, 4 Mar 2010 12:17:05 +0200 From: Alexandr Rybalko <ray@dlink.ua> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-hackers@freebsd.org, RAY <ray@ddteam.net>, Tim Kientzle <kientzle@freebsd.org>, Alex, Ivan Voras <ivoras@freebsd.org> Subject: Re: GEOM_ULZMA Message-ID: <20100304121705.b39ad5b5.ray@dlink.ua> In-Reply-To: <d763ac661003040131n17fcaad8see5531f125351728@mail.gmail.com> References: <20100219163644.da89e882.ray__27111.9062825621$1266591431$gmane$org@dlink.ua> <hlmb66$n0t$1@ger.gmane.org> <20100219222604.44e50248.ray@ddteam.net> <d763ac661002200636u6a0d9546id96fbe2302c7122b@mail.gmail.com> <20100220201510.720c62fd.ray@ddteam.net> <d763ac661002201020g381ab6c0uca6d6fa3f660ed1b@mail.gmail.com> <d763ac661003030001k1055eae8rb106dcc9e73047dc@mail.gmail.com> <4B8E8E5A.5050203@freebsd.org> <d763ac661003040131n17fcaad8see5531f125351728@mail.gmail.com>
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On Thu, 4 Mar 2010 17:31:18 +0800 Adrian Chadd <adrian@freebsd.org> wrote: >> On 4 March 2010 00:29, Tim Kientzle <kientzle@freebsd.org> wrote: >> >> > Interesting question: What is the impact on boot speed? >> > It could be a lot faster to load 5MB from disk and >> > decompress to a 24MB image than to wait for 24MB from >> > disk. >> >> Linear reads from disk are fast. :) Linear reads from the SPI flash >> are slower; and I think the decompression phase is quite a bit slower. >> >> I'll investigate all of this further once I've played with GEOM_ULZMA. LZMA compression optimized for fast decompression. When I compress 3M kernel on DualCore @ 1.80GHz, I wait 3-5 sec. When kernel decompressed by CFE loader on 240MHz MIPS CPU, it less than 2 sec. >> >> >> >> Adrian -- Alexandr Rybalko <ray@dlink.ua> aka Alex RAY <ray@ddteam.net>
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