From owner-freebsd-current  Fri Apr  3 11:53:11 1998
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To: =?koi8-r?B?4c7E0sXKIP7F0s7P1w==?= <ache@nagual.pp.ru>
cc: "Alok K. Dhir" <adhir@worldbank.org>, current@FreeBSD.ORG,
        adkin003@tc.umn.edu
Subject: Re: Working patch *with* splhigh() (Was Re: More info RE: X slowdown in -current) 
In-reply-to: Your message of "Fri, 03 Apr 1998 23:32:42 +0400."
             <19980403233242.31917@nagual.pp.ru> 
Date: Fri, 03 Apr 1998 21:52:12 +0200
Message-ID: <3267.891633132@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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>> So what exactly is the problem you're seing (any URLs I should try ?)
>
>You need no URLs, when Netscape4-communicator starts it draws its icon
>bar. With the bug it draws it at 1icon per 2secs rate. 

Not for me :-(

>Next example is xterm scrolling, usually showed with 'ls -R'.

Not for me :-(

>When you move your mouse intensively, it helps to draw faster since
>generate more events. I use /dev/sysmouse (syscons mouse). 

My xserver is remote, but it still doesn't make any difference :-(

>Something the picture locks completely until you touch mouse.

not here.

>> Does "systat :vm" show abnormally many syscalls ?
>
>I not check.

please do.

>> Does ktrace on your netscape show anything weird ?

>No.
>
>> Could it maybe be the Xserver which is having the trouble, not the
>> netscape process ?
>
>No, when I run Netscape remotely there is no slowness.

Dang.

I can't reproduce it here.  I know the problem you describe, and I
specifically tested with netscape before I committed 1.35 :-(

The problem is that time must somehow become zero when we reach
tsleep() where it should have been non-zero.  I'd be damned if I
can see how that can happen.

The code looks like this:

        s = splhigh();
        if (term && term <= ticks) {
                splx(s);
                goto done; 
        }
        timo = term ? term - ticks : 0; 

The splhigh location is important btw, to protect against just this
problem (ie, ticks changing between the two uses of it.)

Anybody else see this problem with version 1.35 ?

BTW:  The current code is not really what I plan on, but I'm hashing
some ideas out right now with Bruce, which might be even better than
the code I have running here right now...

--
Poul-Henning Kamp             FreeBSD coreteam member
phk@FreeBSD.ORG               "Real hackers run -current on their laptop."
"Drink MONO-tonic, it goes down but it will NEVER come back up!"

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