![]() | |||||||||||||
Messages in this thread |
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. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2006-04-21 07:53 [from the cache] ©2003-2008 | |||||||||||||