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| author | eivind <eivind@FreeBSD.org> | 2000-09-19 10:36:19 +0000 |
|---|---|---|
| committer | eivind <eivind@FreeBSD.org> | 2000-09-19 10:36:19 +0000 |
| commit | c93c4b8a88b470707d07527baafa58bfcac299e5 (patch) | |
| tree | 49e7dff0d33be5c4aa1f56bbe6a3e76756ba918b /sys | |
| parent | 6023f979709dc325fe614123710e7faa12ba79f9 (diff) | |
| download | FreeBSD-src-c93c4b8a88b470707d07527baafa58bfcac299e5.zip FreeBSD-src-c93c4b8a88b470707d07527baafa58bfcac299e5.tar.gz | |
Document ENABLE_VFS_IOOPT
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/conf/NOTES | 13 | ||||
| -rw-r--r-- | sys/i386/conf/NOTES | 13 |
2 files changed, 24 insertions, 2 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES index dcb3bd1..42ded89 100644 --- a/sys/conf/NOTES +++ b/sys/conf/NOTES @@ -718,6 +718,18 @@ options EXT2FS # inclusion on shell boxes. options VFS_AIO +# Enable the code UFS IO optimization through the VM system. This allows +# use VM operations instead of copying operations when possible. +# +# Even with this enabled, actual use of the code is still controlled by the +# sysctl vfs.ioopt. 0 gives no optimization, 1 gives normal (use VM +# operations if a request happens to fit), 2 gives agressive optimization +# (the operations are split to do as much as possible through the VM system.) +# +# Enabling this will probably not give an overall speedup except for +# special workloads. +options ENABLE_VFS_IOOPT + # Cryptographically secure random number generator; /dev/[u]random device random @@ -2543,7 +2555,6 @@ options DEBUG options DEBUG_LINUX #options DISABLE_PSE options ENABLE_ALART -options ENABLE_VFS_IOOPT options FB_DEBUG options FB_INSTALL_CDEV options FE_8BIT_SUPPORT diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index dcb3bd1..42ded89 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -718,6 +718,18 @@ options EXT2FS # inclusion on shell boxes. options VFS_AIO +# Enable the code UFS IO optimization through the VM system. This allows +# use VM operations instead of copying operations when possible. +# +# Even with this enabled, actual use of the code is still controlled by the +# sysctl vfs.ioopt. 0 gives no optimization, 1 gives normal (use VM +# operations if a request happens to fit), 2 gives agressive optimization +# (the operations are split to do as much as possible through the VM system.) +# +# Enabling this will probably not give an overall speedup except for +# special workloads. +options ENABLE_VFS_IOOPT + # Cryptographically secure random number generator; /dev/[u]random device random @@ -2543,7 +2555,6 @@ options DEBUG options DEBUG_LINUX #options DISABLE_PSE options ENABLE_ALART -options ENABLE_VFS_IOOPT options FB_DEBUG options FB_INSTALL_CDEV options FE_8BIT_SUPPORT |
