linux-kernel - Re: [PATCH] PM / Hibernate: Improve performance of LZO/plain hibernation, checksum image

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAGsJ_4wMLnYmj_vNGm7gw8mT6A8RSymQ=G7ABHx9HXvzWa7ZaA@mail.gmail.com>
Date:	Sat, 31 Dec 2011 16:56:12 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Bojan Smojver <bojan@...ursive.com>
Cc:	rjw@...k.pl, linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>
Subject: Re: [PATCH] PM / Hibernate: Improve performance of LZO/plain
 hibernation, checksum image

2011/12/29 Bojan Smojver <bojan@...ursive.com>:
> On Thu, 2011-12-29 at 11:20 +0800, Barry Song wrote:
>> the platform is ARM cortex-a9 single-core 1Ghz SoC and we save image
>> to a SD card or NAND.
>> a phenomenon we saw is that multi-BIOs is not merged into a request by
>> block level elevator. so the SD/NANDdisk driver handles many small
>> request one page by one page.
>
> Interesting, thanks.

we did see some visible IO performance improvement now. the main
reason we didn't see that before is because we enable on-demand
cpufreq in default status. while saving and resuming from snapshot,
cpu frequence is switched frequently due to IO sleep and
compression/uncompression CPU consume. then we enable Performance
policy while booting, and move to on-demand after system boot, we did
see a great performance improvement.
for our inand card, the speed to read/uncompress snapshot is improved
from 7.x MB to 11MB.

>
> --
> Bojan
>
-barry
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/