On Fri, 20 Apr 2007, Maxim Levitsky wrote: > First of all, today, packet writing on cd/dvd doesn't work well, it is very > slow because > now all file-systems are limited to 4k-barrier and cd/dvd can write only > 32k/64k packets. > This is why a pktcdvd was written and it emulates those 4k sectors by doing > read/modify/write cycle > This cause a lot of seeks and read/writing switches and thus it is very slow. > > By introducing a bigger that 4k page cache a dvd/cd can be divided is 64k/32k > blocks that will be read an written freely > (Although dvd can read 2k I don't think that reading a 64k block will hurt > since most of time drive is busy seeking and locating a specific sector) > > Now I thinking to implement this in an other way, I mean I want to teach udf > filesystem to to packet writing on its own, bypassing disk cache (but not > page > cache) > > Secondary 32/64k limitation is present of flash devices too, so they can > benefit too, and I almost sure that future hard disks will use bigger block > size too. > > To summarize I want to tell that bigger pagesize will allow devices that have > big hardware sectors to work fine in linux.
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