Marcelo Tosatti <marcelo@conectiva.com.br> writes:
> On 24 Oct 2001, Zlatko Calusic wrote:
>
> > P.S. BTW, 2.4.13 still has very unoptimal writeout performance and
> > andrea@suse.de is redirected to /dev/null. <g>
>
> Zlatko,
>
> Could you please show us your case of bad writeout performance ?
>
> Thanks
>
Sure. Output of 'vmstat 1' follows:
1 0 0 0 254552 5120 183476 0 0 12 24 178 438 2 37 60
0 1 0 0 137296 5232 297760 0 0 4 5284 195 440 3 43 54
1 0 0 0 126520 5244 308260 0 0 0 10588 215 230 0 3 96
0 2 0 0 117488 5252 317064 0 0 0 8796 176 139 1 3 96
0 2 0 0 107556 5264 326744 0 0 0 9704 174 78 0 3 97
0 2 0 0 99552 5268 334548 0 0 0 7880 174 67 0 3 97
0 2 0 0 89448 5280 344392 0 0 0 9804 175 76 0 4 96
0 1 0 0 79352 5288 354236 0 0 0 9852 176 87 0 5 95
0 1 0 0 71220 5300 362156 0 0 4 7884 170 120 0 4 96
0 1 0 0 63088 5308 370084 0 0 0 7936 174 76 0 3 97
0 2 0 0 52988 5320 379924 0 0 0 9920 175 77 0 4 96
0 2 0 0 43148 5328 389516 0 0 0 9548 174 97 0 4 95
0 2 0 0 35144 5336 397316 0 0 0 7820 176 73 0 3 97
0 2 0 0 25172 5344 407036 0 0 0 9724 188 183 0 4 96
0 2 1 0 17300 5352 414708 0 0 0 7744 174 78 0 4 96
0 1 0 0 7068 5360 424684 0 0 0 9920 175 93 0 3 97
0 1 0 0 3128 4132 430132 0 0 0 9920 174 81 0 4 96
Notice how there's planty of RAM. I'm writing sequentially to a file
on the ext2 filesystem. The disk I'm writing on is a 7200rpm IDE,
capable of ~ 22 MB/s and I'm still getting only ~ 9 MB/s. Weird!
-- 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/
This archive was generated by hypermail 2b29 : Wed Oct 31 2001 - 21:00:24 EST