Monday, January 2, 2012 10:15:08 AM
HPC Linux
Intel VT-D2 provides a feature "Interrupt remapping" in its Intel-64 architecture, can be used for prevent malicious guest OS from DMA to MSI memory area.
Disable and enable interrupt remapping in Linux kernel with kernel option intremap = off/on
Friday, December 30, 2011 7:09:43 AM
Linux kernel develop
Normally
acpi_reboot() only used by SGI UV system.
efi.reset_system() only used by system with EFI enabled.
key board reboot is the default type,
But you can tell kernel to reboot in special mode and type,
Read more...
Wednesday, December 28, 2011 3:00:29 AM
HPC Linux, Linux kernel develop
Found an odd macro definition in Linux kernel
#define UV_BAU_MESSAGE 0xf5
What is UV ?
First of all, This is an interrupt used to broadcast TLB shutdown on some kind of hardware platform, The platform is special
designed to have a broadcast assist unit, The platform is called "SGI UV".
Read more...
Tuesday, December 6, 2011 5:06:51 AM
Linux kernel develop
step 1. init the local repository
#git init
step 2. configure user name and user mail address
#git config --add user.name "ethaxx.xxhao"
#git config --add user.email "ethaxx.xxrnel@gmail.com"
if you wanna set global configuration, issue command as following:
#git config --global user.name "ethaxx.xxhao"
#git config --global user.email "ethaxx.xxrnel@gmail.com"
view current git configuration
#git config -l
Read more...
Saturday, December 3, 2011 5:32:55 AM
iphone
2009-12-19 15:13
和同事换用了2天手机,用我的G3换他的Iphone，最后真舍不得给他，有些着迷了。
G3 很山寨，玩G3，玩的是寂寞，根本没有一个比较完美的ROM给你刷，你刷了一圈的ROM之后，消耗无数的寂寞光阴，手里的还不是一个成熟完美的智能手机。
Read more...
Saturday, December 3, 2011 3:14:29 AM
auto.travel
Camera PENTAX K-5
Original resolution 922x615
Shutter Speed 0.00125 sec
F-number f/2.4
Picture taken 2011:11:20 14:05:26
Lens Pentax DA 70mm F/2.4
Saturday, August 27, 2011 1:09:40 PM
After upgraded the HDD from Hitachi 7K200-100 100G(avg 50MB/s) to 7K500-500 500G(avg 85MB/s), The whole system gains great performance improvement, But,today when I test the temperature of CPU and GPU etc with a tool called Master Lu, the temperature of CPU rose up to 95C and the system died. It really scared me.
So it is necessary to open it and clean the CPU fan ,refill the silica gel, not complex , I took me about 30 mins, After
that the temperature of CPU stayed under 80C even stressed with heavy load.
Friday, March 25, 2011 3:18:54 PM
K-5 photos
High ISO photos by PENTAX K-5 of ShangHai's night
Tuesday, March 8, 2011 7:36:58 AM
network nic
Statistical Counters
The 8255x provides information for network management by providing on-chip statistical counters
that track a variety of events associated with both transmit and receive. The counters are updated
by the device when it completes the processing of a frame. For example, after the completion of
transmitting a frame on the link or when receiving a frame, the counter is updated. The Statistical
Counters are reported to the software on demand by issuing the Dump Statistical Counters
command or the Dump and Reset Statistical Counters command in the SCB CUC field. The
counters are internal to the device and are listed in the table below.
Read more...
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