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Reduce MAXPHYS back to 128KB on 32bit architectures.

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Some of them have limited KVA, like arm, which prevents startup from
allocating needed number of large pbufs.  Other, for instance i386,
are dis-balanced enough after 4/4 that blind bump is probably harmful
because it allows for much more in-flight io than other tunables are
ready for.

Requested by:	mmel
Reviewed by:	emaste, mmel
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2020-11-29 19:06:32 +00:00
parent bd89101586
commit baa2cd58a6
1 changed files with 6 additions and 2 deletions
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8
sys/sys/param.h
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@ -159,8 +159,12 @@
#ifndef DFLTPHYS #ifndef DFLTPHYS
#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
#endif #endif
#ifndef MAXPHYS #ifndef MAXPHYS /* max raw I/O transfer size */
#define MAXPHYS (1024 * 1024) /* max raw I/O transfer size */ #ifdef __ILP32__
#define MAXPHYS (128 * 1024)
#else
#define MAXPHYS (1024 * 1024)
#endif
#endif #endif
#ifndef MAXDUMPPGS #ifndef MAXDUMPPGS
#define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)