> On 25 Oct 2001, Zlatko Calusic wrote:
> >
> > Yes, I definitely have DMA turned ON. All parameters are OK. :)
>
> I suspect it may just be that "queue_nr_requests"/"batch_count" is
> different in -ac: what happens if you tweak them to the same values?
>
Next test:
block: 1024 slots per queue, batch=341
Wrote 600.00 MB in 71 seconds -> 8.39 MB/s (7.5 %CPU)
Still very spiky, and during the write disk is uncapable of doing any
reads. IOW, no serious application can be started before writing has
finished. Shouldn't we favour reads over writes? Or is it just that
the elevator is not doing its job right, so reads suffer?
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 1 1 0 3600 424 453416 0 0 0 0 190 510 2 1 97
0 1 1 0 3596 424 453416 0 0 0 40468 189 508 2 2 96
0 1 1 0 3592 424 453416 0 0 0 0 189 541 1 0 99
0 1 1 0 3592 424 453416 0 0 0 0 190 513 1 0 99
1 1 1 0 3592 424 453416 0 0 0 0 192 511 0 1 99
0 1 1 0 3596 424 453416 0 0 0 0 188 528 0 0 100
0 1 1 0 3592 424 453416 0 0 0 0 188 510 1 0 99
0 1 1 0 3592 424 453416 0 0 0 41444 195 507 0 2 98
0 1 1 0 3592 424 453416 0 0 0 0 190 514 1 1 98
1 1 1 0 3588 424 453416 0 0 0 0 192 554 0 2 98
0 1 1 0 3584 424 453416 0 0 0 0 191 506 0 1 99
0 1 1 0 3584 424 453416 0 0 0 0 186 514 0 0 100
0 1 1 0 3584 424 453416 0 0 0 0 186 515 0 0 100
1 1 1 0 3576 424 453416 0 0 0 0 434 1493 3 2 95
1 1 1 0 3564 424 453416 0 0 0 40560 301 936 3 1 96
0 1 1 0 3564 424 453416 0 0 0 0 338 1050 1 2 97
0 1 1 0 3560 424 453416 0 0 0 0 286 893 1 2 97
-- Zlatko - 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/