Volker.Lendecke at SerNet.DE
Tue Dec 9 07:50:56 GMT 2008
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
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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 189 bytes
Desc: not available
Url : http://lists.samba.org/archive/samba-technical/attachments/20081209/d32c8430/attachment.bin
More information about the samba-technical