Re: KVA_PAGES

In reply to: void : "KVA_PAGES"
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From: Chris <bsd-lists_at_bsdforge.com>
Date: Fri, 08 Mar 2024 15:54:34 UTC

On 2024-03-08 01:35, void wrote:
> Hi,
> 
> In 14-stable on amd64, what's the default value for KVA_PAGES ?
> I'm asking because WINE says something about it:
> 
> "Some ZFS tuning guides recommend setting KVA_PAGES=512 in your kernel
> configuration.  This is incompatible with Wine.  The maximum possible
> is KVA_PAGES=500, which should still be enough for ZFS."
> 
> I can't find a KVA_PAGES setting in /usr/src/sys/amd64/conf/*
Apologies if this has already been answered. But a trip to /usr/src/sys
followed by a
# grep -F KVA_PAGES -RH .
./conf/options.i386:KVA_PAGES		opt_global.h
./i386/i386/pmap.c:	 * KPTmap is created that can support KVA_PAGES page 
table pages.
./i386/i386/pmap.c:	SYSMAP(pt_entry_t *, KPTD, KPTmap, KVA_PAGES)
./i386/include/pmap.h:#define NKPDE	(KVA_PAGES)	/* number of page 
tables/pde's */
./i386/include/pmap_nopae.h:#define KVA_PAGES	(256*4)
./i386/include/pmap_pae.h:#define KVA_PAGES	(512*4)

HTH

--Chris