Become a fan of Slashdot on Facebook

 



Forgot your password?
typodupeerror
×

Comment Re:Sniffing? (Score 4, Interesting) 307

If you're worried that the possibility someone is going to perform an MITM attack on you is greater than infinitesimal

...or the DNS cache gets poisoned, as I once saw. (Thankfully, SSH does a reverse lookup as well and checks the result matches the input, and bails if they don't.)

Comment Re:Happens in other OSes, too. (Score 2, Funny) 206

That and certain drives also have a mind of their own and ignore any hdparm APM setting after a short while in favour of their own, absurdly aggressive setting. One I have (by default) unloads after 8 seconds of inactivity and the only way to change it is by some obscure DOS utility that I can't get to work. 8 seconds is crazy-low, and because the typical interval for disc activity on a Linux system under enthusiastic use is typically 10-15 seconds (or even when a bit idle, as lots of other things touch the filesystem in the backgrounds), the heads spend a lot of time loading and unloading. It's possible to tune the Linux VM subsystem to ouch the disc less often, but in practise doesn't make much of a difference. Windows XP does exactly the same. The disc manufacturer says Linux should not wake up the disc so frequently, but I don't see how that squares with the way a modern, multitasking operating system works; things touch the filesystem, and this must be synced in good time (I don't want 30 seconds' worth of dirty data just sitting in RAM). And besides, disc manufacturers should just make discs and leave VM policy to kernel designers.

Comment Re:Not experience this (Score 2, Informative) 206

ACPI does not normally (and from what I've seen, never) export any controls over battery charging, or even allow the user to choose power supply. The job of handling power is usually done by the embedded controller and its firmware, which also handles any charging (along with circuitry designed specifically for the job). This is designed for optimal performance of the system in mind and usually works very well. The operating system just monitors the state of the power supply and can make demand-related decisions (CPU power-state, screen brightness, sleep/shutdown) based upon a chosen policy. If batteries really are packing up early in the manner suggested, this is more likely down to a hardware/firmware/miscellaneous-ACPI-EC-horkage defect in the notebook itself, not the operating system.

Slashdot Top Deals

Any program which runs right is obsolete.

Working...