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| author | maybee <none@none> | 2006-07-18 18:09:14 -0700 |
|---|---|---|
| committer | maybee <none@none> | 2006-07-18 18:09:14 -0700 |
| commit | 13506d1eefbbc37e2f12a0528831d9f6d4c361d7 (patch) | |
| tree | 2d671d0dd6124ab6c7653af1af4d94c468df0388 /usr/src/uts/common/syscall/rw.c | |
| parent | 97669b901409b5fd29dd43e8a2ee1d17564ca0dc (diff) | |
| download | illumos-joyent-13506d1eefbbc37e2f12a0528831d9f6d4c361d7.tar.gz | |
6447377 ZFS prefetch is inconsistant
Diffstat (limited to 'usr/src/uts/common/syscall/rw.c')
| -rw-r--r-- | usr/src/uts/common/syscall/rw.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/usr/src/uts/common/syscall/rw.c b/usr/src/uts/common/syscall/rw.c index a7b5ce6b9d..3eb98b50ac 100644 --- a/usr/src/uts/common/syscall/rw.c +++ b/usr/src/uts/common/syscall/rw.c @@ -2,9 +2,8 @@ * CDDL HEADER START * * The contents of this file are subject to the terms of the - * Common Development and Distribution License, Version 1.0 only - * (the "License"). You may not use this file except in compliance - * with the License. + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. @@ -20,7 +19,7 @@ * CDDL HEADER END */ /* - * Copyright 2005 Sun Microsystems, Inc. All rights reserved. + * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ @@ -52,9 +51,9 @@ #include <sys/rctl.h> #include <sys/nbmlock.h> -#define COPYOUT_MIN_SIZE (1<<17) /* 128K */ +#define COPYOUT_MAX_CACHE (1<<17) /* 128K */ -static size_t copyout_min_size = COPYOUT_MIN_SIZE; +size_t copyout_max_cached = COPYOUT_MAX_CACHE; /* global so it's patchable */ /* * read, write, pread, pwrite, readv, and writev syscalls. @@ -167,7 +166,7 @@ read(int fdes, void *cbuf, size_t count) /* * Only use bypass caches when the count is large enough */ - if (bcount < copyout_min_size) + if (bcount <= copyout_max_cached) auio.uio_extflg = UIO_COPY_CACHED; else auio.uio_extflg = UIO_COPY_DEFAULT; @@ -723,7 +722,7 @@ readv(int fdes, struct iovec *iovp, int iovcnt) auio.uio_segflg = UIO_USERSPACE; auio.uio_llimit = MAXOFFSET_T; auio.uio_fmode = fflag; - if (bcount < copyout_min_size) + if (bcount <= copyout_max_cached) auio.uio_extflg = UIO_COPY_CACHED; else auio.uio_extflg = UIO_COPY_DEFAULT; |