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Date:      Thu, 12 Jan 2017 10:26:07 -0800
From:      John Baldwin <jhb@freebsd.org>
To:        freebsd-current@freebsd.org
Cc:        Shawn Webb <shawn.webb@hardenedbsd.org>, Jakob Alvermark <jakob@alvermark.net>
Subject:   Re: r311568 makes freerdp very slow
Message-ID:  <1610370.k87iRho0oa@ralph.baldwin.cx>
In-Reply-To: <20170112174211.5nmvpjatg6zap35a@mutt-hardenedbsd>
References:  <57236.193.12.143.142.1484240708.squirrel@webmail.alvermark.net> <20170112174211.5nmvpjatg6zap35a@mutt-hardenedbsd>

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On Thursday, January 12, 2017 12:42:11 PM Shawn Webb wrote:
> On Thu, Jan 12, 2017 at 06:05:08PM +0100, Jakob Alvermark wrote:
> > Hi,
> > 
> > r311568 Set MORETOCOME for AIO write requests on a socket.
> > 
> > After this commit freerdp is very slow.
> > 
> > Before the password prompt would appear immediately when connecting to a
> > server. Now it takes 5-10 seconds. After entering the password, another
> > 5-10 seconds until I am connected.
> > Once connected, there is a considerable lag.
> > 
> > What could be the problem?
> 
> I don't know what the problem is, but I am seeing the same symptom.

Can you get a ktrace of the freerdp process during this?  The commit
should only be setting MORETOCOME if multiple aio_write requests are
queued to the same socket (so that TCP can batch them into a single
packet).  However, it should not affect an application just calling
aio_write() on a socket once.

-- 
John Baldwin



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