On 2002.05.10 21:31 Stephen C. Tweedie wrote: > Hi, > > On Thu, May 09, 2002 at 11:55:32AM +0100, Ian Leonard wrote: > > > I have checked 2.4.18 and 2.5 kernels and there seems to > > be an interface but no actual implementation. > > > > It has been suggested that it only works with ext2 but we > > need ext3. > > That's right. > > But the ext2 is pretty much only a wrapper around a generic_direct_IO > function, so it would be pretty easy to use that same wrapper for > ext3. It would be tricky to make it work with data=journal mode, but > the other data modes ought to be easy to get going. I my case this wouldn't matter too much. I am trying to improve the performance of an application that writes video data to the disk. I have mounted the relevant filesystem with various data= options but it doesn't seem to make any difference to my test program (which simply writes a large file to disk and times it). I am far from familiar with the internals of filing systems. Do you think this feature is likely to appear in the near future. Also would it be a 2.4 or a 2.5 thing? Currently through-put doesn't look too bad but I see that there is a drop off every 30 seconds. I assumed that this was bdflush and fiddled with the options but haven't seen an improvement yet. Thanks for your help. Any words of wisdom appreciated. -- Ian Leonard eMail: ileonard@ntlworld.com Phone: +44 (0)1865 765273 Please ignore spelling and punctuation - I did.
