Messages in this thread | | | Date | Sun, 18 Sep 2005 18:34:50 +0200 | From | Willy Tarreau <> | Subject | Re: Eradic disk access during reads |
| |
On Sun, Sep 18, 2005 at 07:02:17PM +0300, Denis Vlasenko wrote: > > > My CPU is not that new: > > > > PII - 400Mhz here. > > I meant that kernel seem to eat too much CPU here. This > is not expected. I expected CPU bar to be all D.
This is often caused by disks running in PIO instead of DMA.
> > Also, great meter! Best of all does not hog the CPU! > > Could you add a top3 procs display? > > What is a "top3 procs display"?
probably something which will turn your tool into sort of a complex and unusable one when another session running 'top' could do the trick.
Oh, BTW, the first reason I wrote my tool was to avoid copying into /dev/null which consumes a small amount of CPU. Thus, I made it a pure data eater. It might be interesting to run it instead of 'dd' while your tool is running, to see if system usage decreases a bit.
Regards, Willy
- 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/
| |