Gianluca Gennari wrote:
(was: Re: PCTV 290e page allocation failure)
On MIPS/ARM set-top-boxes, as well as old x86 PCs, memory allocation failures
in the em28xx driver are common, due to memory fragmentation over time, that
makes impossible to allocate large chunks of coherent memory.
A typical system with 256/512 MB of RAM fails after just 1 day of uptime (see
the old thread for detailed reports and crashlogs).
In fact, the em28xx driver allocates memory for USB isoc transfers at runtime,
as opposite to the dvb-usb drivers that allocates the USB buffers when the
device is initialized, and frees them when the device is disconnected.
Moreover, in digital mode the USB isoc transfer buffers are freed, allocated
and cleared every time the user selects a new channel, wasting time and
resources.
Does this patch have a chance of getting in?
I am still having to flush caches before use. If you want more testing I
can give it a go. I didn't earlier as I didn't have a git to apply it to
and thought it was going to get in anyway.
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