Am Montag 27 September 2010 schrieb Nigel Cunningham: > Hi again Rafael. Hi Nigel and Rafael, > As discussed, here are the patches, modified to apply against your > current linux-next tree. A new first patch splits compression support > out into its own file, removing the need to have two versions of the > load_image and save_image routines, minimising the changes to the > remainder of the patches and making things cleaner than would > otherwise be the case. > > On my laptop, single-threaded compression actually slows writing down > from 175MB/s to around 100-120MB/s (depending on how well the image > compresses). Reading speed improves from 218MB/s to around 245MB/s. I > expect that multithreaded writing would bring the writing (and > reading) speeds back up. It's on my swsusp to do list :) Testing this now (2.6.36-rc4-tp42-suspend-next-vmembase-0-00253-gab9b069- dirty). So far so fast: shambhala:~> grep Image /var/log/syslog | tail -30 Sep 29 09:11:07 shambhala kernel: PM: Image restored successfully. Sep 29 09:11:07 shambhala kernel: PM: Image written at 47 MB/s. Sep 29 09:11:07 shambhala kernel: PM: Image read at 45 MB/s. Sep 29 20:59:32 shambhala kernel: PM: Image restored successfully. Sep 29 20:59:32 shambhala kernel: PM: Image written at 42 MB/s. Sep 29 20:59:32 shambhala kernel: PM: Image read at 43 MB/s. Sep 30 19:17:57 shambhala kernel: PM: Image restored successfully. Sep 30 19:17:57 shambhala kernel: PM: Image written at 62 MB/s. Sep 30 19:17:57 shambhala kernel: PM: Image read at 42 MB/s. Oct 1 11:26:19 shambhala kernel: PM: Image restored successfully. Oct 1 11:26:19 shambhala kernel: PM: Image written at 18 MB/s. Oct 1 11:26:19 shambhala kernel: PM: Image read at 45 MB/s. Oct 2 10:30:24 shambhala kernel: PM: Image restored successfully. Oct 2 10:30:24 shambhala kernel: PM: Image written at 65 MB/s. Oct 2 10:30:24 shambhala kernel: PM: Image read at 42 MB/s. Oct 2 17:44:33 shambhala kernel: PM: Image restored successfully. Oct 2 17:44:33 shambhala kernel: PM: Image written at 74 MB/s. Oct 2 17:44:33 shambhala kernel: PM: Image read at 116 MB/s. Oct 2 17:56:18 shambhala kernel: PM: Image restored successfully. Oct 2 17:56:18 shambhala kernel: PM: Image written at 68 MB/s. Oct 2 17:56:18 shambhala kernel: PM: Image read at 125 MB/s. Oct 2 17:57:40 shambhala kernel: PM: Image restored successfully. Oct 2 17:57:40 shambhala kernel: PM: Image written at 67 MB/s. Oct 2 17:57:40 shambhala kernel: PM: Image read at 121 MB/s. Oct 2 17:58:47 shambhala kernel: PM: Image restored successfully. Oct 2 17:58:47 shambhala kernel: PM: Image written at 67 MB/s. Oct 2 17:58:47 shambhala kernel: PM: Image read at 124 MB/s. Oct 2 18:43:40 shambhala kernel: PM: Image restored successfully. Oct 2 18:43:40 shambhala kernel: PM: Image written at 68 MB/s. Oct 2 18:43:40 shambhala kernel: PM: Image read at 122 MB/s. shambhala:~> The read ahead patches bring a pretty nice performance upgrade ;). I wonder a bit about: Oct 1 11:26:19 shambhala kernel: PM: Image written at 18 MB/s. This has been without read ahead patches which shouldn't interfere with writing anyway. Ciao, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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