* Direct access to IDE disk from kernel modules
@ 2002-04-15 9:19 Enrico BRAVIN
2002-04-15 9:44 ` Alan Cox
0 siblings, 1 reply; 2+ messages in thread
From: Enrico BRAVIN @ 2002-04-15 9:19 UTC (permalink / raw)
To: linux-kernel
Hi,
Is there a way to directly dump a buffer on an IDE disk from inside a
kernel module without goig trough user space?
I have written a driver for a frame grabber and would like be able to
dump the frames real time directly to a dedicated IDE disk.
My frames are already in a DMAble buffer.
Please cc my directly
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Direct access to IDE disk from kernel modules
2002-04-15 9:19 Direct access to IDE disk from kernel modules Enrico BRAVIN
@ 2002-04-15 9:44 ` Alan Cox
0 siblings, 0 replies; 2+ messages in thread
From: Alan Cox @ 2002-04-15 9:44 UTC (permalink / raw)
To: Enrico BRAVIN; +Cc: linux-kernel
> Is there a way to directly dump a buffer on an IDE disk from inside a
> kernel module without goig trough user space?
> I have written a driver for a frame grabber and would like be able to
> dump the frames real time directly to a dedicated IDE disk.
> My frames are already in a DMAble buffer.
You can get the same effect going via user space just fine, and the
performance of IDE is well below the point that should make a difference
since PCI bandwidth is likely to be your bottleneck.
mmap the capture buffers into a user application (eg video4linux api), then
write the files using the O_DIRECT option or a raw device (see rawctl and
friends)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2002-04-15 9:19 Direct access to IDE disk from kernel modules Enrico BRAVIN
2002-04-15 9:44 ` Alan Cox
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