Kernels: 2.4.15-pre6 and 2.4.15pre6aa1
Tests: Fill and write to 80% of vitual memory 10 times.
mmap, touch, msync, and munmap 500000 pages 5 times.
Simultaneously listen to long mp3 sampled at 128k with
mp3blaster.
Summary: 2.4.15-pre6 49% faster on memfill test with higher mp3
play time. 2.4.15-pre6 11% faster on mmap test.
Config diff: CONFIG_RWSEM_XCHGADD_ALGORITHM=y in 2.4.15-pre6
Hardware:
Athlon 1333
1024 MB RAM
1024 MB swap
2.4.15-pre6 used a higher percentage of CPU time for both tests.
2.4.15-pre6 played 97% of mp3 and 2.4.15pre6aa1 played 84% during memfill test.
I include one iteration of vmstat 1 from the memfill test because of differences
in b, free, memcache, etc columns.
2.4.15-pre6
-------------
mp3 played 297 seconds of 304 second run. (97%)
Averages for 10 mtest01 runs
bytes allocated: 1652241203
User time (seconds): 7.621
System time (seconds): 6.058
Elapsed (wall clock) time: 30.314
Percent of CPU this job got: 44.60
Major (requiring I/O) page faults: 103.8
Minor (reclaiming a frame) faults: 404169.7
vmstat 1 from second iteration of mtest01 -w -p 80:
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
3 0 0 587712 2784 1164 7860 0 70656 56 70656 1278 2094 11 24 65
2 0 0 4560 863708 1204 8256 0 11136 432 11140 562 942 49 26 25
2 0 0 4560 695072 1236 8256 0 0 8 40 311 575 75 25 0
2 0 0 4560 525692 1236 8256 0 0 0 0 277 540 74 26 0
3 0 0 4560 357032 1236 8384 0 0 128 0 301 564 81 19 0
2 0 0 4560 187624 1236 8384 0 0 0 0 300 542 81 19 0
2 0 0 4560 17892 1236 8384 0 0 0 0 309 603 83 17 0
2 1 1 86896 4932 1172 7812 0 15384 40 15416 554 1779 10 77 13
9 0 2 139632 2176 1164 7808 0 92680 36 92672 1717 2363 5 15 80
1 2 1 150768 2564 1188 7820 0 27052 92 27080 612 843 35 16 49
2 1 0 184176 2240 1172 7812 0 35876 20 35884 718 1136 10 30 60
1 1 0 218864 2660 1176 7816 0 36720 28 36724 625 1113 15 36 49
1 2 0 243952 2584 1176 7812 0 35880 20 35880 612 1059 13 22 64
0 2 0 303600 2604 1176 7816 248 55772 344 55800 1097 1960 13 24 63
1 1 0 363632 2580 1168 7820 0 51452 48 51460 1049 1929 14 26 60
0 2 0 400496 2656 1176 7816 0 49192 36 49192 819 1348 11 24 65
0 2 1 450672 2552 1188 7820 0 49416 44 49444 911 1699 11 26 62
2 2 0 498416 2592 1172 7820 0 44628 40 44632 901 1658 13 24 64
1 2 0 535408 2644 1176 7816 0 40996 32 41000 706 1295 14 20 66
0 2 0 584432 2548 1172 7816 0 49024 40 49028 901 1664 13 26 62
1 2 0 643568 2608 1172 7816 0 59132 316 59160 1158 1951 14 24 63
2 0 0 18580 880156 1208 7992 272 220 496 224 537 938 51 26 22
mp3 played 807 seconds of 808 second run.
Average for 5 mmap001 runs
bytes allocated: 2048000000
User time (seconds): 4.184
System time (seconds): 25.596
Elapsed (wall clock seconds) time: 161.70
Percent of CPU this job got: 18.00
Major (requiring I/O) page faults: 500153.2
Minor (reclaiming a frame) faults: 35.6
2.4.15pre6aa1
-------------
mp3 played 370 seconds of 454 second run. (84%)
Averages for 10 mtest01 runs
bytes allocated: 1666501836
User time (seconds): 7.602
System time (seconds): 3.114
Elapsed (wall clock) time: 45.371
Percent of CPU this job got: 23.20
Major (requiring I/O) page faults: 145.0
Minor (reclaiming a frame) faults: 407645.8
vmstat 1 from second iteration of mtest01 -w -p 80:
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 1 580208 28232 1180 1272 84 23680 192 23684 466 709 8 13 79
2 1 0 9524 1009964 1248 2204 332 384 1316 428 459 617 11 15 74
2 0 0 9520 855112 1268 2476 28 0 316 0 303 569 78 19 3
3 0 0 9520 685728 1268 2476 0 0 0 0 275 543 76 24 0
2 0 0 9520 516008 1268 2476 0 0 0 0 275 544 81 19 0
2 0 0 9520 346556 1268 2476 0 0 0 0 275 540 75 25 0
3 0 0 9520 176932 1284 2476 0 0 0 24 292 547 85 15 0
1 1 1 12588 27572 1176 1392 236 5084 388 5092 549 818 53 22 25
1 9 1 27532 27876 1200 488 380 14684 692 14688 563 562 6 17 77
1 6 1 47108 26108 1176 600 428 19696 896 19700 657 666 6 15 79
0 5 0 80120 28000 1188 628 688 32992 1132 33028 971 896 7 16 77
1 4 1 92892 26452 1164 728 576 12800 1144 12804 573 626 6 14 80
0 5 1 120796 25832 1164 744 496 28032 804 28036 795 714 6 16 77
1 5 1 146776 26608 1164 792 408 25984 680 26012 764 704 6 12 81
2 3 1 189528 27004 1180 796 408 42496 688 42500 1097 1292 8 9 83
1 2 1 210132 26724 1184 800 192 20864 276 20868 446 609 10 12 78
0 3 1 239188 26760 1168 836 28 28800 224 28828 700 1299 14 6 80
1 4 1 264012 27108 1172 840 76 24704 216 24712 586 1084 10 10 81
1 3 0 284224 28652 1176 836 36 20480 252 20484 524 992 7 7 86
1 2 1 306748 28208 1184 844 24 22656 164 22660 522 993 11 6 82
3 0 2 326972 26608 1192 880 0 20224 176 20252 492 866 12 10 78
0 3 1 351036 26608 1180 864 0 23936 132 23956 550 850 9 8 82
2 2 1 375612 27792 1176 876 0 24704 196 24708 514 776 5 12 83
2 1 1 400316 27972 1184 892 4 24596 200 24600 571 777 10 4 86
0 3 2 429116 26612 1188 900 4 28780 148 28800 546 878 10 8 81
2 2 1 464316 28404 1164 912 8 35072 252 35084 678 1085 10 11 80
1 3 1 491320 27356 1184 976 68 27136 556 27140 611 864 9 8 83
0 4 0 515384 28860 1184 952 40 24064 180 24068 550 812 8 6 85
0 4 0 550020 28860 1176 956 144 34816 268 34844 670 1164 12 6 82
2 2 0 578676 27648 1172 984 24 28544 196 28548 568 985 10 12 79
1 3 1 603868 27948 1180 976 24 25216 168 25220 534 835 8 13 79
0 4 1 631624 26608 1172 1004 20 27648 188 27652 504 825 12 8 80
2 3 1 662184 26904 1172 996 56 30592 224 30624 658 1076 9 7 84
0 4 0 9712 1011020 1236 1460 308 7680 876 7684 516 775 6 11 83
mp3 played 901 seconds of 902 second run.
Average for 5 mmap001 runs
bytes allocated: 2048000000
User time (seconds): 3.560
System time (seconds): 23.622
Elapsed (wall clock seconds) time: 180.49
Percent of CPU this job got: 14.60
Major (requiring I/O) page faults: 500191.6
Minor (reclaiming a frame) faults: 30.4
Hope this information is useful!
--
Randy Hron
On Sun, Nov 18, 2001 at 09:57:20AM -0500, [email protected] wrote:
> Hope this information is useful!
yes it's useful. It seems normal, as said this kernel isn't going to
swap very easily, it tends to shrink the cache too much, and I only
cared to fix the >=3G boxes with no swap at all but with lots of cache
where I wanted to be sure the anon pages into the lru weren't going to
make the system sluggish (google setup incidentally). I increased
significantly the vm_mapped_ratio default setting to be sure no to have
swap_out in our way during the testing (of course, increasing
vm_mapped_ratio doesn't mean the swap_out doesn't work, but only makes
harder to the machine to run into swap, it tends to shrink the cache
more).
So if you've time to test, I'd like to know what you get also after a:
echo 9 >/proc/sys/vm/vm_mapped_ratio
and also after backing out those two patches in order:
ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.15pre6aa1/10_vm-14-no-anonlru-1-simple-cache-1
ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.15pre6aa1/10_vm-14-no-anonlru-1
and again using "echo 9 >/proc/sys/vm/vm_mapped_ratio" after backing out
the two patches.
thanks for the feedback,
Andrea
On Mon, Nov 19, 2001 at 01:23:12AM +0100, Andrea Arcangeli wrote:
>
> echo 9 >/proc/sys/vm/vm_mapped_ratio
>
> and also after backing out those two patches in order:
>
> ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.15pre6aa1/10_vm-14-no-anonlru-1-simple-cache-1
> ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.15pre6aa1/10_vm-14-no-anonlru-1
>
> and again using "echo 9 >/proc/sys/vm/vm_mapped_ratio" after backing out
> the two patches.
>
> thanks for the feedback,
Andrea,
Changing vm_mapped_ratio from 50 to 9 improved the time on the mmap001
test by 11%.
Backing out the 2 patches and changing vm_mapped_ratio to 9 improved the
time on the memfill tests by 28% and improved mp3 playtime as well. :)
2.4.15-pre6-vm_scan_rate=9
--------------------------
played 360 seconds of mp3 in 453 second test (79%)
Averages for 10 mtest01 runs
bytes allocated: 1665138688
User time (seconds): 7.605
System time (seconds): 3.139
Elapsed (wall clock) time: 45.214
Percent of CPU this job got: 23.30
Major (requiring I/O) page faults: 144.6
Minor (reclaiming a frame) faults: 407313.4
played 808 seconds of mp3 in 813 second test (99%)
Average for 5 mmap001 runs
bytes allocated: 2048000000
User time (seconds): 3.530
System time (seconds): 23.138
Elapsed (wall clock seconds) time: 162.60
Percent of CPU this job got: 15.80
Major (requiring I/O) page faults: 500191.8
Minor (reclaiming a frame) faults: 30.2
2.4.15-pre6-vm_scan_rate=9
without: 10_vm-14-no-anonlru-1-simple-cache-1 10_vm-14-no-anonlru-1
--------------------------
played 318 seconds of mp3 in 356 second test (89%)
Averages for 10 mtest01 runs
bytes allocated: 1668179558
User time (seconds): 7.672
System time (seconds): 3.322
Elapsed (wall clock) time: 35.637
Percent of CPU this job got: 30.50
Major (requiring I/O) page faults: 154.4
Minor (reclaiming a frame) faults: 408058.2
played 796 seconds of mp3 in 806 second test (99%)
Average for 5 mmap001 runs
bytes allocated: 2048000000
User time (seconds): 3.402
System time (seconds): 23.298
Elapsed (wall clock seconds) time: 161.46
Percent of CPU this job got: 15.80
Major (requiring I/O) page faults: 500190.4
Minor (reclaiming a frame) faults: 31.6
--
Randy Hron