Messages in this thread | | | Subject | Re: [PATCH] scheduler fixups ... | From | Peter Osterlund <> | Date | 03 Jan 2002 01:36:28 +0100 |
| |
Davide Libenzi <davidel@xmailserver.org> writes:
> On 2 Jan 2002, Peter Osterlund wrote: > > > Davide Libenzi <davidel@xmailserver.org> writes: > > > > > a still lower ts > > > > This also lowers the effectiveness of nice values. In 2.5.2-pre6, if I > > run two cpu hogs at nice values 0 and 19 respectively, the niced task > > will get approximately 20% cpu time (on x86 with HZ=100) and this > > patch will give even more cpu time to the niced task. Isn't 20% too > > much? > > The problem is that with HZ == 100 you don't have enough granularity to > correctly scale down nice time slices. Shorter time slices helps the > interactive feel that's why i'm pushing for this.
OK, but even architectures with bigger HZ values will suffer. Isn't it better to set MIN_NICE_TSLICE to a smaller value (such as 1000) and fix the calculation in fill_tslice_map to make sure ts_table[i] is always non-zero. The current formula will break anyway if
HZ < 1000000 / MIN_NICE_TSLICE = 100,
but maybe HZ >= 100 is true for all architectures?
-- Peter Osterlund - petero2@telia.com http://w1.894.telia.com/~u89404340 - 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/
| |