| === _LibertyZero is now known as LibertyZero | ||
| === lifeless_ is now known as lifeless | ||
| * [7] is observing weird I/O behavior with natty's 2.6.38-1209-omap4 kernel | 23:36 | |
| [7] | when reading from a USB HDD, the relationship between read block sizes and throughput looks like this: http://paste.ubuntu.com/604616/ | 23:36 |
|---|---|---|
| [7] | (the buffer cache has been flushed with hdparm -f between every measurement) | 23:36 |
| [7] | this HDD gets about 28MB/s on windows, and about 32MB/s without this weird foldback on my natty x86 desktop: http://paste.ubuntu.com/604619/ | 23:36 |
| [7] | the same (but to a lesser extent) happens with slower USB storage devices as well: http://paste.ubuntu.com/604613/ (this thumbdrive gets 5MB/s on windows) | 23:36 |
| [7] | this also appears to affect SD card access, but also to a lesser extent: http://paste.ubuntu.com/604605/ | 23:36 |
| [7] | does anyone have an idea what might be causing this, or how i could try to debug it? | 23:36 |
| ohsix | anyone know offhand what the practical difference between clear_page and clear_page_c is | 23:59 |
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