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Date: Fri, 03 Jun 2011 01:26:11 -0700
From: Maxim Sobolev <sobomax@FreeBSD.org>
Organization: Sippy Software, Inc.
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To: Mikolaj Golub <trociny@freebsd.org>
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Cc: Pawel Jakub Dawidek <pjd@FreeBSD.ORG>,
	"current@freebsd.org" <current@FreeBSD.ORG>
Subject: Re: Weird issue with hastd(8)
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On 5/29/2011 4:11 AM, Mikolaj Golub wrote:
> This might be MSG_WAITALL issue I described on net@ (look for the thread
> "recv() with MSG_WAITALL might stuck when receiving more than rcvbuf", and
> also kern/154504).
>
> Could you please try the patch?
>
> http://people.freebsd.org/~trociny/uipc_socket.c.patch

Yes, installing this patch on both client and server has solved this 
issue. Synchronization now goes much faster.

I would also like to get your input on my two other patches - 
randomization of the synchronization pattern and ad-hoc asynchronous 
more. Hastd appears extremely useful to synchronize large virtual disks 
over slow links without taking live virtual machine offline.

-Maxim