Messages in this thread | | | Date | Fri, 21 Apr 2006 06:02:35 +1000 | From | Nick Piggin <> | Subject | Re: Linux 2.6.17-rc2 |
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Linh Dang wrote: > Jens Axboe <axboe@suse.de> wrote:
>>DVD burning probably isn't a good splice fit, since you need to do >>more than actually just point the device at the data. SG_IO is >>already zero-copy as it maps the user data into the kernel without >>copying, so there's very little room for improvement there to begin >>with. > > > DVD burning on linux is mostly: > > mkisofs .... | growisofs .... > > Ideally, on mkisofs side, we'd be able to: > > - write some data/padding into the pipe > - splice a HUGE file into the pipe > - write some data/padding into the pipe > - splice a HUGE file into the pipe > ... > > On growisofs side, we'd be able to: > > - send some commands > - splice N MBs of data from the pipe to the driver > - send some commands > - splice M MBs of data from the pipe to the driver > ... > > What'd be nice is an ioctl to change the size of the pipe between > mkisofs and growisofs.
I don't see why the pipe buffers would be a problem though. It isn't like you've lost any of the pagecache buffering (eg. from readahead) or the application level buffering.
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