On Tue, Dec 09, 2008 at 01:55:09AM -0500, Theodore Tso wrote: > On Tue, Dec 09, 2008 at 05:25:29PM +1100, ronnie sahlberg wrote: > > > > Its not as simple as "the redirector does it every 128k". the > > redirector does this but it varies from run to run and from client to > > client. > > It is very common to see this happening in 60-64kb strides and other > > strides as well. > > > > It is probably some interaction with how large the actual i/o that the > > application did internally to the cache and some other thing. > > but anyway, it varies a lot. it is not always 128k. > > Is there a maximum stride size used by the redirector? i.e., will it > use something bigger than 128k? In any case, increasing the ext3 > reservation window size should still be helpful. It's OK if we > increase it to 32 blocks (128k, on a 4k block filesystem), and the > stride size is smaller than that. But if it is often bigger than > 128k, then then it would probably be better if samba used the > EXT3_IOC_SETRSVSZ ioctl to dynamically set the reservation size as > appropriate. One might try to use "dd" from Cygwin on Windows. When I once analyzed this behaviour, the 1-byte writes were exactly at the end of the block the Win32 app gave to the kernel as seen by the sysinternals filemon tool. Volker
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