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i386/PAE busdma: allow more bounce pages.

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If i386 has more than 4G of memory, allow the same number of busdma
bounce pages as for amd64.  In fact, in this case bouncing sometimes
is much heavier than on amd64.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D18854
This commit is contained in:
Konstantin Belousov 2019-01-18 13:43:11 +00:00
parent 957b9bbf3c
commit 8f0916fc11
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=343147
1 changed files with 1 additions and 1 deletions
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sys/x86/x86/busdma_bounce.c
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@ -57,7 +57,7 @@ __FBSDID("$FreeBSD$");
#include <x86/include/busdma_impl.h>
#ifdef __i386__
#define MAX_BPAGES 512
#define MAX_BPAGES (Maxmem > atop(0x100000000ULL) ? 8192 : 512)
#else
#define MAX_BPAGES 8192
#endif