On my system (RedHat 9): $ cat /proc/version Linux version 2.4.20-8 ([EMAIL PROTECTED]) (gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)) #1 Thu Mar 13 17:54:28 EST 2003
# hdparm -d /dev/hda /dev/hda: using_dma = 1 (on) When I did ``cat /dev/zero > junk``, the system did become half-irresponsive (not critically). Since DMA is already on, is there any point in upgrading the kernel? Another question: "fork bomb"s. I think this was much worse a few years ago but still, when I do:: perl -e 'for $i (1..15) { fork(); }' the system gets completely stuck for a few seconds. Increasing the number increases the stuck time. Isn't a unix suppossed to protect users from such DOS attacks in some way (just checked, executing it from another user has exactly the same effect)? Perhaps it does: curiously enough, after doing this a dozen times, it seems that linux has "learnt" the trick: I can now fork 2^20 times with no effect! Can someone enlighten me what goes on? -- Beni Cherniavsky <[EMAIL PROTECTED]> ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]