Am Samstag 25 September 2010 schrieb Nigel Cunningham: > Hi Rafael. > > Please find attached a slightly updated version of the patchset I sent > a few months ago. The main change is that I've prepended and additional > patch which lets the user see the speed at which the image is being > read and written. This is accomplished by recording the MB/s in a > single byte in the image header, and using a couple of __nosavedata > variables to get the data back through the atomic restore. I realise > the char limits us to 255MB/s at the moment. In future patches, I > intend to address this by storing the data in a 'proper' image header > (it's a real problem - TuxOnIce reads and writes on the same set up at > speeds around 250MB/s). > > Results on my Dell XPS M1530, which has an SSD hard drive are: > > With just patch 1 applied: > Attempt 1: Write 74MB/s; Read 52MB/s > Attempt 2: Write 68MB/s; Read 52MB/s > Attempt 3: Write 73MB/s; Read 53MB/s > > With the whole sequence: > Attempt 1: Write 181MB/s; Read 52MB/s > Attempt 2: Write 156MB/s; Read 53MB/s > Attempt 3: Write 160MB/s; Read 52MB/s Is doesn't get much stabler than shambhala:~> grep "PM: Image.*at " /var/log/syslog Sep 28 11:32:06 shambhala kernel: PM: Image written at 63 MB/s. Sep 28 11:32:06 shambhala kernel: PM: Image read at 32 MB/s. Sep 28 11:35:00 shambhala kernel: PM: Image written at 65 MB/s. Sep 28 11:35:00 shambhala kernel: PM: Image read at 32 MB/s. Sep 28 11:38:43 shambhala kernel: PM: Image written at 65 MB/s. Sep 28 11:38:43 shambhala kernel: PM: Image read at 33 MB/s. Sep 28 11:41:15 shambhala kernel: PM: Image written at 66 MB/s. Sep 28 11:41:15 shambhala kernel: PM: Image read at 33 MB/s. Sep 28 11:42:57 shambhala kernel: PM: Image written at 66 MB/s. Sep 28 11:42:57 shambhala kernel: PM: Image read at 34 MB/s. Sep 28 11:45:16 shambhala kernel: PM: Image written at 66 MB/s. Sep 28 11:45:16 shambhala kernel: PM: Image read at 34 MB/s. Sep 28 12:19:21 shambhala kernel: PM: Image written at 66 MB/s. Sep 28 12:19:21 shambhala kernel: PM: Image read at 35 MB/s. Sep 28 12:21:35 shambhala kernel: PM: Image written at 65 MB/s. Sep 28 12:21:35 shambhala kernel: PM: Image read at 35 MB/s. Sep 28 12:23:18 shambhala kernel: PM: Image written at 65 MB/s. Sep 28 12:23:18 shambhala kernel: PM: Image read at 35 MB/s. Sep 28 12:25:23 shambhala kernel: PM: Image written at 64 MB/s. Sep 28 12:25:23 shambhala kernel: PM: Image read at 36 MB/s. Sep 28 12:26:55 shambhala kernel: PM: Image written at 65 MB/s. Sep 28 12:26:55 shambhala kernel: PM: Image read at 37 MB/s. Sep 28 12:28:28 shambhala kernel: PM: Image written at 65 MB/s. Sep 28 12:28:28 shambhala kernel: PM: Image read at 37 MB/s. many attempts. So - without readahead patch for now - Tested-By: Martin Steigerwald <Martin@xxxxxxxxxxxx> on 2.6.36-rc5. Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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