Subject: Re: write() in nonblocking mode can be slow.
To: Martin Husemann <>
From: Thor Lancelot Simon <>
List: netbsd-users
Date: 03/11/2005 10:57:47
On Fri, Mar 11, 2005 at 08:13:03AM +0100, Martin Husemann wrote:
> On Fri, Mar 11, 2005 at 11:57:50AM +0900, Jorgen Lundman wrote:
> > I have a socket (TCP) connected where their end is very slow. (~3k/s). 
> Have you checked with tcpdump that ACKs are coming in fast enough? You may
> have a full tcp window outstanding, so new data can only be sent once
> more data is acknowledge by the peer.

Yes, but he is seeing nonblocking writes block in the kernel for multiple
seconds before returning.  That should never happen.

 Thor Lancelot Simon	                            

"The inconsistency is startling, though admittedly, if consistency is to be
 abandoned or transcended, there is no problem."		- Noam Chomsky