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If you can get your controller and drive using a DMA mode, do it. But I have seen more than one machine hang while playing with this option. Again, see the manpage and the example on the next page! And some multi-reads might work. Almost double the disk throughput without really trying!

Of course, enabling these gets riskier. Why is it always a trade-off between freedom and security? Unfortunately this seems to be unsupported on this particular box it hung like an NT box running a Java app. A far cry from the miniscule 3. By the way, notice how we specified the -m16 and -c3 switch again? That's because it doesn't remember your hdparm settings between reboots.

At least not with a straight face Now, after running the benchmark a few more times, reboot in multi-user mode and fire up X. Load Netscape. And try not to fall out of your chair. In conclusion This is one of those interesting little tidbits that escapes many "seasoned" Linux veterans, especially since one never sees any indication that the system isn't using the most optimal settings.

Gee, all my kernel messages have looked fine And using hdparm isn't completely without risk, but is well worth investigating. And it doesn't stop at performance: hdparm lets you adjust various power saving modes as well.

Many thanks to Mark Lord for putting together this nifty utility. Command m for help : p. You are running BETA version of reiserfs shrinker. Backup of you data is recommended. Do you want to continue?

ReiserFS report: blocksize block count free blocks bitmap block count The number of cylinders for this disk is set to There is nothing wrong with that, but this is larger than , and could in certain setups cause problems with: 1 software that runs at boot time e. Command m for help : d Partition number : 6. Command m for help : w The partition table has been altered! Calling ioctl to re-read partition table.

The kernel still uses the old table. The new table will be used at the next reboot. Syncing disks. Mem: 0 Swap: Settings for eth Supported ports: [ TP ]. Supports auto-negotiation: Yes. Advertised auto-negotiation: Yes. Duplex: Half.

Port: Twisted Pair. PHYAD: 0. Transceiver: internal. Auto-negotiation: on. Supports Wake-on: d. Wake-on: d. Current message level: 0x 7. Link detected: yes. The sections below will guide you through different steps to optimize your Linux server for your specific processor, memory, and network, as well as your file system.

All customizations that you put in this file will apply for the entire environment variable on your system, so putting optimization flags in this file is a good choice. To squeeze the most performance from your x86 programs, you can use full optimization when compiling with the -O9 flag. Many programs contain -O2 in the Makefile. It will increase the size of what it produces, but it runs faster.

If you have an x and above processor, surely, but below x, not necessarily. When compiling, use the -fomit-frame-pointer switch for any kind of processor you may have. This will use the stack for accessing variables. Unfortunately, debugging is almost impossible with this option. However, the resulting code will only be run able on the indicated CPU or higher. The optimization options apply only when we compile and install a new program in our server.

Recommended optimization flags. The egcs compiler is already installed on your Server by default so you don't need to worry about it. This will produce code that runs somewhat faster on a Pentium at the expense of more memory. This avoids the instructions to save, set up and restores frame pointers; it also makes an extra register available in many functions and makes debugging impossible on most machines.

We generally tune this file to improve file system performance. By changing some values from the default as shown below, the system seems more responsive; e. The default setup for the bdflush parameters under Red Hat Linux is: "40 64 2" To change the values of bdflush, type the following command on your terminal: 6. Improve file system performance vm.

Dirty means that the contents of the buffer still have to be written to disk as opposed to a clean buffer, which can just be forgotten about. It is necessary to allocate free buffers beforehand, since the buffers often are of a different size than memory pages and some bookkeeping needs to be done beforehand. The value is expressed in jiffies clockticks ; the number of jiffies per second is The buffermem parameters The buffermem file is also closely related to the operation of the virtual memory VM subsystem of the Linux kernel.

It is important to note that the percentage is calculated as a percentage of total system memory. The default setup for the buffermem parameters under Red Hat Linux is: "2 10 60". To change the values of buffermem, type the following command on your terminal:. TXT For Later. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Related Interests Nature. Evan Husada Sidrap. Drs Mulatua.

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