Feb 12

The Slumgirl

Scribbled on Thursday, February 12th, 2009

Rubina Ali ( kid Latika from Slumdog Millionaire), in her slum with her dear ones

Oh poverty, in thy holiness, I shall exploit you to grovel up to Golden Globes or perhaps, may be, Oscars
But lest you are not the one who ever spent a day in embrace of it, I doubt you can measure the depth of scars
A momentary guilt and shedding two tears will be enough, I doubt you can still measure the depth of farce

Feb 11

Memory Module Configurations

Scribbled on Wednesday, February 11th, 2009

I recently upgraded my system RAM by adding one 2GB RAM module. I already had 1GB RAM module inserted into DIMM socket. So first thing was to check out the best possible configuration to for optimal performance. Flex mode was  the only best possible solution for my motherboard (intel DG965RY) with 4 DIMM sockets.

The DIMM0 sockets of both channels are blue. The DIMM1 sockets of both channels are black.

Typical Motherboard DIMM slot view

Dual Channel (Interleaved) Mode

This mode offers the highest throughput for real world applications. Dual channel mode is enabled when the installed memory capacities of both DIMM channels are equal. Technology and device width can vary from one channel to the other but the installed memory capacity for each channel must be equal. If different speed DIMMs are used between channels, the slowest memory timing will be used.

Dual Channel (Interleaved) Mode configuration using Two identical DIMM modules

Dual Channel (Interleaved) Mode configuration using Three DIMM modules, note that each Channel A and Channel B have same amount of memory

Dual Channel (Interleaved) Mode configuration using four DIMM modules, note that each Channel A and Channel B have same amount of memory

Single Channel (Asymmetric) Mode

This mode is equivalent to single channel bandwidth operation for real world applications. This mode is used when only a single DIMM is installed or the memory capacities are unequal. Technology and device width can vary from one channel to the other. If different speed DIMMs are used between channels, the slowest memory timing will be used

Single Channel (Asymmetric) Mode with only one DIMM, note that memory distribution in Channel A and Channel B is uneven

Single Channel (Asymmetric) Mode with three DIMMs, note that memory distribution in Channel A and Channel B is uneven

Flex Mode

This mode provides the most flexible performance characteristics. The bottommost DRAM memory (the memory that is lowest within the system memory map) is mapped to dual channel operation; the topmost DRAM memory (the memory that is nearest to the 8 GB address space limit), if any, is mapped to single channel operation. Flex mode results in multiple zones of dual and single channel operation across the whole of DRAM memory. To use flex mode, it is necessary to populate both channels

The use of flex mode requires DIMMs to be installed in both channels.
•   The 512 MB DIMM in the Channel A, DIMM 0 socket and the lower 512 MB of the DIMM in the Channel B, DIMM 0 socket operate together in dual channel mode.
•   The remaining (upper) 512 MB of the DIMM in Channel B operates in single channel mode.

Flex Mode configuration with two DIMMs

References: Intel DG965RY manual

Feb 10

When Ubuntu Freezes

Scribbled on Tuesday, February 10th, 2009

What to do if your system is not responding and gone into eternal freeze. You might be tempted to press the restart button on the CPU cabinet or will turn off the UPS.

In other Linux distros these magic key combination can be enabled by either of the given below tricks:

1.Execute this command with root privileges

echo 1 > /proc/sys/kernel/sysrq

or permanently enable it

2. Add this line to sysctl.conf (/etc/sysctl.conf)

kernel.sysrq = 1

The easiest trick is to directly communicate with the Kernel via /proc filesystem.

  • Press Alt + SysRq/Prt Scr key and type REISUB

It will safely restart your PC with no loss of data (in most cases). Remember it as Reboot Even If System Utterly Broken.

What if you wanted to shut down the PC

  • Press Alt + SysRq/Prt Scr key and then type REISUO

Explanation:

  • R tries to communicate with Keyboard directly without the need of X window system
  • E tries to end processes by giving them stop/terminate signal (SIGTERM), its a respectful request
  • I this is for SOB processes which don’t listen to the kernel, they are killed (SIGKILL) to free the resource locks, thou shalt die who didn’t heed
  • S to write the cached changes to the filesystem, so that data is proof written to the disk and poses no data loss
  • U now its the time to unmount the filesystems and remount them as read only
  • B restarts the sytem
  • O turn off/Shut down the system

So next time keep this little handy trick to show some mercy to your system and valuable data.

Feb 09

Duh !

by T on Monday
Feb 09

Holy cows !

by T on Monday
Feb 05

Must watch Korean movies - III

by T on Thursday
Feb 04

Clear Swap forcefully in Ubuntu !

by T on Wednesday
Feb 03

Change default theme for root applications in Ubuntu

by T on Tuesday
Feb 02

The Gooboy who never Loved !

by T on Monday
Jan 31

Joomla can be more friendly for hackers too !!!

by T on Saturday


July 2009
M T W T F S S
« Jun    
 12345
6789101112
13141516171819
20212223242526
2728293031