I ran a lot of tests because I have a similar problem.
I have 3 configurations:
1. PII Celeron 500MHz, 256MB RAM, 512 MB SWAP 36 GB IDE HDD, ext2, RedHat 6.1
2. PIII 500 MHz, 1GB RAM, 1 GB and 2x1GB SWAP (because of testing situations), 18 GB SCSI HDD (Initio A100U2W, ATLAS10K3_18_WLS [hdparm -t = 52.01 MB/sec!!!]), ext3 and ext2, RedHat 8.0
3. Dell Latitude C810, PIII 1.13 GHz, 512 RAM, 1GB SWAP, 20 GB IDE HDD, ext3
I've tried to search in a big gzipped (24MB, extracted size is 277MB) text file.
The command was: zgrep pattern1 any.txt | grep pattern2
Results: 1: 14 sec 2: 2min 15 sec 3: 53 sec
The weakest the best... :(
The most interesting that in INIT 1 the 2nd and 3rd configurations performed much more better:
2: 13 sec!!!
3: 4 sec!!!
I've tried to kill all of processes an unload all of modules and change settings to generate the most closest enviroment to INIT1 (I' ve started to do it in INIT5 and INIT3). The result was nothing (same)!!!! Then I've tried to start up the system manually from INIT1 but the system now kept the good performance. The only difference was the mingetty in the process list, then I've tried to run my search script from cron in INIT5 and in INIT3 (to skip mingetty), but the result vas as terrible as before.
I've also tried other kernels on 2nd and 3rd configurations: 2.4.14 "factory original, install kit", 2.4.18 "latest, redhat build", 2.4.18 bigmem (on 2nd only) "latest RedHat build" és 2.4.20 (bigmem and without bigmem) "home build". The result was also terrible.
Have somebody solved this performace problem since the first letter in this subject?
Regards!
Pal
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