use ReleaseSCSITask to release SCSITaskIdentifier

because GetSCSITask will increase fNumCommandsOutstanding,

we must use this function to decrease fNumCommandsOutstanding

adjust aio queue length

sysctl -a | grep aio

find property about aio

sudo sysctl -w kern.aiomax=256

sudo sysctl -w kern.aioprocmax=256

sudo sysctl -w kern.aiothreads=256

for linux:

aio-max-nr

ftp command

mput *.js:

put every file that ends with .js

iostat

watch disk performance

ex:

iostat -w 1

display every second

kernel debug

type 14 = page fault

error code: 0: read from a non-present page

2: write to a non-present page

EIP: address of instruction at panic

create symbol file:

/Volumes/KernelDebugKit/createsymbolfiles -s /tmp PanicDriver/build/Debug/PanicDriver.kext

assume 0x223ab275 is EIP address

gdb /Volumes/KernelDebugKit/mach_kernel

--> set kext-symbol-file-path /tmp

--> add-kext ~/test.kext

--> set print asm-demangle on

--> x/i 0x223ab275

find the function mapped to this address

--> disass 0x223ab275

show this function's content

--> info line * 0x223ab275

show the line number of EIP in the function

vifs

edit /etc/fstab

set the disk not automount

UUID=5BFDB0C1-B240-3429-B9B0-20022AFBAA3C /test hfs rw,noauto

transfer visual project to xcode

1. new project -> Standard Tool

2. get visual project from cvs ( not get from visual stdio)

3. copy the files in visual project into this xcode project directory

4. set SCM Repository