Messages in this thread | | | Date | Sun, 10 Nov 2002 17:27:06 +0100 | From | Andrea Arcangeli <> | Subject | Re: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest |
| |
On Sun, Nov 10, 2002 at 11:12:47AM +0100, Kjartan Maraas wrote: > lør, 2002-11-09 kl. 14:54 skrev Jens Axboe: > > [SNIP] > > > The default is 2048. How long does the io_load test take, or rather how > > The default on my RH system with the latest errata kernel is as follows: > > [root@sevilla kmaraas]# elvtune /dev/hda > > /dev/hda elevator ID 0 > read_latency: 8192 > write_latency: 16384 > max_bomb_segments: 6
that has still the bugs in 2.4.19 and all previous 2.4 that I found and that I fixed first with an limited patch, not complete, and then Jens fixed it competely after I showed him the bugs while explaining him why I did the first limited patch (then Jens's patch gone in 2.4.20pre).
so a 8192 there, isn't comparable to a 8192 in 2.4.20rc, Jens was of course aware and just lowered it to 2048 but that is probably still more than a 8192 in previous 2.4, it would be possible to do the math to calculate the exact value in some common case but I guess we want a sane default, not necessairly the exact same behaviour, so I guess benchmarking is more useful than doing the math to calculate the exact new value to get the exact same behaviour.
Andrea - 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/
| |