Hi.
I'm a very much end user, but this issue at hand is a kernel problem.
I'm running a custom made vanilla linux-3.0.4; when I transfer a large
file to a slow USB flash device, there're random freezes in random
applications -- top target is Chromium and Yakuake.
Someone told me this's cause of excessive dirty buffers in memory, but
after trying a verity of combination from the kernel parameters in
/proc/sys/vm, it didnt work.
By my understanding if the dirty pages exceed the dirty_ratio/bytes
limit all IO freezes, but in my case applications in memory freeze, the
I/O is not related. For e.g. the the Yakuake terminal drops down, it
hangs for a minutes -- this action doesn't have to do anything with IO,
but only in memory.
Then tabs in chromium hang randomly, this's again not related to I/O.
I tried reducing ditry_raio, dirty_background_ratio to 2, then I
increased min_free_kbytes, but none of them matter. I noticed that even
when an application freezes, there's ample of free memory.
This problem was not reproducible with vanilla kernel 2.6.38.
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