Slow write performance with Win 98 and Samba (fwd)

David Collier-Brown davecb at
Thu Jun 21 15:45:16 GMT 2001

Kenichi Okuyama wrote:
> Before I start connecting windows machine, I run
> # sysctl -w net.inet.tcp.delayed_ack=0

George Fytikas of Sun Americas' Customer Engineering wrote:
| tcp_deferred_ack_interval was at the centre of the investigation,
| but it is "The time to wait before sending delayed ACK" in ms.
| tcp_deferred_acks_max puts a cap on delayed ack.  The default 
| is 8.  Setting it to 1 will make our tcp conform to the "ack 
| every other packet" policy suggested  by rfc1122.  Setting it 
| to 0 will disable delayed ack totally.

	This is worth trying on a Solaris Samba server to see
	if setting it to 1 will make the Windows TCP
	stack perform...

David Collier-Brown,           | Always do right. This will gratify 
Performance & Engineering Team | some people and astonish the rest.
Americas Customer Engineering  |                      -- Mark Twain
(905) 415-2849                 | davecb at

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