Messages in this thread | | | Date | Fri, 28 Mar 2003 14:01:08 -0800 | From | jjs <> | Subject | Re: very poor performance in 2.5.66[-mm1] |
| |
Just out of curiosity, does it help to say:
export LANG=en_US
?
David Mansfield wrote:
>On Fri, 28 Mar 2003, Andrew Morton wrote: > > >>>After all of the rave reviews about the interactivity fixes (both regular >>>and I/O scheduler related), I decided to give the 2.5.latest a try on my >>>desktop machine (system described below) >>> >>>I started X, everything seemed fine, maybe a bit faster. I opened a >>>'gnome-terminal' and typed 'ls -ltr'. Wow, it was 20x slower. >>> >>>Here are the timings for 'ls -ltr': >>> >>>2.5.66-mm1: 'ls -ltr' 31 seconds >>>2.5.66-mm1: 'ls -ltr | cat' 2 seconds >>>2.4.18-rhlatest: 'ls -ltr' 1.14 seconds >>> >>> >>How many files were there? >> >> > >1337 files. > > > >>My /usr/bin contains 3168 files. An `ls -ltr' in gnome-terminal takes 9.6 >>seconds. In rxvt it takes 0.5 seconds. That's an 850MHz P3. >> >>So gnome-terminal appears to be a pretty slow application. My guess would be >>that something in the 2.5 kernel has exposed a marginality or an outright >>bug in it. >> >> > >Yes. gnome-terminal is godawful slow on RHAT 8.0 (it does Xrender >alpha-channel crap for every character to get the anti-aliasing). But I >think the problem has to do with the pipe/pty wakeups. After 'ls' writes >a line to the pty, it seems as though the gnome-terminal is being woken up >(even though 'ls' has more to write), it's generating the Xrender >X-command and sending it to X. X is waking up and rendering it (which >forces a complete update of the screen). > >Under 2.4.18-whatever, it would seem as though 'ls' is generating a large >number of lines of output before the gnome-terminal is waking up, causing >a dramatically fewer number of redraws. > > > >>It would be interesting to edit include/asm-i386/param.h and set HZ to 100. >> >> >> > >I'll try to check this out over the weekend. > >David > > >
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |