From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Sun, 29 Nov 2009 17:34:55 -0500
To: 9fans@9fans.net
Message-ID: <f3005ad67a9d9b1e953d29565c31fa40@ladd.quanstro.net>
In-Reply-To: <<13426df10911291403m64599f85mfcc91325b63a661@mail.gmail.com>>
References: <<13426df10911291403m64599f85mfcc91325b63a661@mail.gmail.com>>
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Subject: Re: [9fans] strangeness on a server
Topicbox-Message-UUID: a4e33460-ead5-11e9-9d60-3106f5b1d025

> one thing that I don't understand: when it starts up I get a line like this:
> mem -1 bcmem 0 icmem 0
>
> Does this point to misconfiguration or will venti do something reasonable here?

it looks like a little bit of misconfiguration, which the current
code makes too easy.  i'm not sure this is the root cause of
your problems.  since venti also does a big dance to try to make
memory misconfiguration non-fatal.

did you upgrade the hardware?  i have some tricks in
9atom (source ftp://ftp.quanstro.net/other/kernel.mkfs.bz2)
in particular, /dev/irqalloc has an extra field that will tell you
how many interrupts a particular vector has taken.  this
can be useful in narrowing down the guilty parties.

- erik

/n/dump/2009/1129/sys/src/cmd/venti/srv/venti.c:54,59 - /sys/src/cmd/venti/srv/venti.c:54,70
  }

  void
+ minmem(u32int *mem, u32int *icmem, u32int *bcmem)
+ {
+ 	if ((int)*icmem < 6 * 1024 * 1024)
+ 		*icmem = 6 * 1024 * 1024;
+ 	if ((int)*mem < 1 * 1024 * 1024)		/* lumps */
+ 		*mem = 1 * 1024 * 1024;
+ 	if ((int)*bcmem < 2 * 1024 * 1024)
+ 		*bcmem = 2 * 1024 * 1024;
+ }
+
+ void
  usage(void)
  {
  	fprint(2, "usage: venti [-Ldrsw] [-a ventiaddr] [-c config] "
/n/dump/2009/1129/sys/src/cmd/venti/srv/venti.c:184,195 - /sys/src/cmd/venti/srv/venti.c:195,201
  			mem = avail;
  			bcmem = 2 * avail;
  		}
- 		if (icmem < 6 * 1024 * 1024)
- 			icmem = 6 * 1024 * 1024;
- 		if (mem < 1 * 1024 * 1024)		/* lumps */
- 			mem = 1 * 1024 * 1024;
- 		if (bcmem < 2 * 1024 * 1024)
- 			bcmem = 2 * 1024 * 1024;
+ 		minmem(&mem, &icmem, &bcmem);
  		config.mem = mem;
  		config.bcmem = bcmem;
  		config.icmem = icmem;
/n/dump/2009/1129/sys/src/cmd/venti/srv/venti.c:201,207 - /sys/src/cmd/venti/srv/venti.c:207,214
  		bcmem = config.bcmem;
  	if(icmem == 0)
  		icmem = config.icmem;
- 	fprint(2, "%s: mem %d bcmem %d icmem %d...", argv0, mem, bcmem, icmem);
+ 	minmem(&mem, &icmem, &bcmem);
+ 	fprint(2, "%s: mem %ud bcmem %ud icmem %ud...", argv0, mem, bcmem, icmem);

  	if(haddr == nil)
  		haddr = config.haddr;