Date: Thu, 2 Apr 1998 00:52:50 -0800 (PST) From: Doug White <dwhite@gdi.uoregon.edu> To: Mik Firestone <fireston@lexmark.com> Cc: freebsd-questions@FreeBSD.ORG, "John S. Dyson" <toor@dyson.iquest.net> Subject: Re: swap_pager: suggest more swap space Message-ID: <Pine.BSF.3.96.980402004539.8262I-100000@gdi.uoregon.edu> In-Reply-To: <199804011554.AA17336@interlock2.lexmark.com>
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On Wed, 1 Apr 1998, Mik Firestone wrote:
> I am seeing the message:
> swap_pager: suggest more swap space: 126MB
> on a frequent bsis and I do not recall having seen that recently. I am using
> a new kernel that I CVSUP'd yesterday (3.0-CURRENT).
>
> I am curious as to why this message is being generated, is it serious and does
> it mean 126Mb *more* or total?
>
> As I have 131Mb swap already I have a very hard time believing I need 126Mb
> more. Of course, if I already have 131Mb, I already have 126Mb don't I? Oh -
> swapinfo tells me I have 84Mb available.
Hm, I'm wondering if a variable is rolling over then. The message appears
in src/sys/vm/swap_pager.c, function swap_pager_getswapspace():
static int
swap_pager_getswapspace(object, amount, rtval)
vm_object_t object;
unsigned int amount;
daddr_t *rtval;
{
unsigned location;
vm_swap_size -= amount;
if (!suggest_more_swap && (vm_swap_size < btodb(cnt.v_page_count *
PAGE_SIZE))) {
printf("swap_pager: suggest more swap space: %d MB\n",
(2 * cnt.v_page_count * (PAGE_SIZE / 1024)) /
1000);
suggest_more_swap = 1;
}
[...]
cnt.v_page_count or vm_swap_size may be rolling over. You can disable
this by either #ifdef'ing it out or setting suggest_more_swap = 1 before
this block.
I'll pass this on to John Dyson, or VM guru, for further analysis.
> PS - Why, when I search on swap_pager, via your Web page, does it seem to be
> replacing the underscore with a space? I got a lot of hits on swap, and a few
> more hits on pager, but nothing I could see on swap_pager.
Could be an interpolation bug. Try escaping the _ with a \: \_
> PPS - How do I CC: any replies, discussion, etc such that it will be
> stored in the archives?
Most mail readers do this automatically; just make sure the reply ends up
on the list. Pine does this, see my header.
Doug White | University of Oregon
Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant
http://gladstone.uoregon.edu/~dwhite | Computer Science Major
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