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Date: Sat, 15 Sep 2007 18:11:13 -0700 From: "David Madsen" <david.madsen@...il.com> To: "Francois Romieu" <romieu@...zoreil.com> Cc: netdev@...r.kernel.org Subject: Re: r8169: slow samba performance > Do you see a difference in the system load too, say a few lines of 'vmstat 1' ? This is running on a dual core machine which explains the 50/50 sys/idle in vmstat. with 8168 hack (patch #0002): writes: isis tmp # dd if=/dev/zero of=test.fil bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 13.5288 s, 77.5 MB/s procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 200 714568 2944 227964 0 0 4 74592 44243 12190 1 45 52 2 1 0 200 637656 3028 305016 0 0 0 79324 45579 12795 1 48 27 24 1 0 200 556688 3112 383816 0 0 4 82880 48222 13901 1 49 50 1 1 0 200 475936 3196 462280 0 0 8 78736 47925 13942 1 50 49 1 0 0 200 394992 3284 540676 0 0 12 74592 47657 13949 1 48 50 1 reads: isis tmp # dd if=test.fil of=/dev/null bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 34.7543 s, 30.2 MB/s procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 200 18652 3952 913524 0 0 19996 0 18650 2000 1 13 83 4 0 0 200 19476 3940 912772 0 0 24576 0 15846 1725 0 12 88 0 0 0 200 22540 3940 910156 0 0 14336 0 9470 1024 0 8 91 0 0 0 200 25180 3924 907660 0 0 14336 0 10084 1076 0 8 92 0 1 0 200 17764 3920 915248 0 0 24576 0 16046 1669 1 13 87 0 0 0 200 18732 3936 914528 0 0 24592 0 17136 1963 0 13 86 1 0 0 200 29152 3924 904816 0 0 40996 0 25609 2776 0 19 80 1 0 0 200 35040 3880 899548 0 0 36872 0 24288 2589 1 18 81 1 0 0 200 15524 3904 919540 0 0 36888 0 24506 2664 0 19 80 0 0 0 200 23964 3904 911872 0 0 43048 64 27498 2934 0 22 76 2 0 0 200 15960 3908 920564 0 0 59444 0 38224 4096 0 29 68 3 0 0 200 14936 3908 921916 0 0 26652 0 18401 1957 1 15 82 3 1 0 200 30392 3916 906864 0 0 10248 0 7225 863 0 6 94 1 0 0 200 14836 3896 922768 0 0 32796 0 20830 2313 1 16 80 4 0 0 200 35152 3896 902788 0 0 30748 0 20679 2340 0 16 79 5 with ndelay(10) loop: writes: isis tmp # dd if=/dev/zero of=test.fil bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 13.7967 s, 76.0 MB/s 1 0 0 694080 6448 248252 0 0 0 78736 44235 12588 1 50 50 0 1 0 0 613448 6524 326400 0 0 0 78736 44215 12477 1 50 50 0 1 0 0 535612 6628 403796 0 0 8 91668 45789 10741 0 52 23 24 0 0 0 454132 6704 482848 0 0 0 78736 47082 10795 1 51 49 0 1 0 0 373804 6784 560780 0 0 4 75008 46826 10418 1 49 51 0 1 0 0 292216 6860 639976 0 0 0 82880 47279 10544 1 51 49 0 reads: isis tmp # dd if=test.fil of=/dev/null bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 21.894 s, 47.9 MB/s procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 0 14968 3736 920920 0 0 44968 0 21886 3068 0 33 60 7 0 0 0 13120 3672 922908 0 0 32768 0 17486 2326 0 26 74 0 1 0 0 24796 3640 912136 0 0 51212 4 29417 3637 1 44 56 0 1 0 0 52104 3600 886072 0 0 49688 0 29329 3602 0 42 57 0 1 0 0 44548 3564 894164 0 0 43808 0 28066 3418 0 41 57 2 0 0 0 16676 3608 922400 0 0 47148 0 25292 3313 0 36 59 4 0 0 0 37392 3604 902580 0 0 51248 0 27554 3512 1 40 59 1 1 0 0 23988 3648 916468 0 0 49196 0 26621 3393 0 39 61 1 1 0 0 16232 3696 924692 0 0 51248 0 28792 3536 1 43 56 1 0 1 0 18548 3732 921472 0 0 39416 0 21470 2736 1 31 66 2 2 0 0 13620 3760 928296 0 0 40520 0 22081 2818 0 33 65 1 0 0 0 18828 3732 923900 0 0 53252 0 28577 3611 0 43 57 0 1 0 160 13308 3736 929712 0 0 43012 0 22924 2920 1 33 66 0 1 0 176 13316 2668 931348 0 0 40964 0 23122 2899 0 34 66 0 0 0 176 13764 1900 932416 0 0 53260 0 28571 3601 0 42 57 0 0 1 176 14076 1744 931300 0 0 51672 0 28600 3845 1 42 58 0 1 0 176 16380 1620 931164 0 0 52828 0 27832 3518 1 41 58 1 Load is definately higher with the ndelay(10) loop but throughput on reads is quite a bit better as well. > Can you add the patch below on top of #0002 and see if there is some > benefit from it ? writes: isis tmp # dd if=/dev/zero of=test.fil bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 13.6414 s, 76.9 MB/s procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 1 200 496436 5676 440184 0 0 342 16003 8770 2051 4 26 55 14 2 0 200 431808 5692 504456 0 0 4 67180 36908 11169 1 43 26 31 1 0 200 351524 5692 582756 0 0 0 76508 45336 11191 1 49 50 0 2 0 200 270928 5768 661040 0 0 0 78736 46283 11709 1 50 50 0 1 0 200 190804 5844 738648 0 0 0 78736 45110 10442 0 49 51 0 reads: isis tmp # dd if=test.fil of=/dev/null bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 31.3864 s, 33.4 MB/s procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 200 14612 2604 929304 0 0 24576 0 16047 1715 1 15 85 0 0 0 200 16752 2604 927504 0 0 36864 4 24174 2618 1 23 77 0 0 0 200 14308 2592 930324 0 0 45060 1272 28799 3281 0 27 69 4 1 0 200 13800 2592 930896 0 0 34816 0 22206 2596 1 20 77 3 0 0 200 13940 2592 930736 0 0 12288 0 7745 943 0 8 92 0 1 0 200 17096 2580 927552 0 0 12288 0 7963 957 0 7 93 0 > > I'd welcome if you could try the patch below on top of #0002 too: > writes: after finishing writes: eth0: wait_max = 9 isis tmp # dd if=/dev/zero of=test.fil bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 13.8243 s, 75.9 MB/s procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 0 180056 3000 752876 0 0 0 74592 37500 4810 1 52 47 0 2 0 0 103060 3072 827492 0 0 0 77780 36297 3803 1 49 50 0 1 0 0 32320 3152 901552 0 0 0 75964 38510 5022 1 54 40 5 1 0 0 40728 3024 891948 0 0 0 74592 35930 3861 1 51 49 0 1 0 0 18328 3092 913288 0 0 0 74592 36354 4391 1 53 47 0 reads: isis tmp # dd if=test.fil of=/dev/null bs=1M count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 23.5534 s, 44.5 MB/s 0 0 200 15696 2884 921820 0 0 40960 0 26874 2792 0 38 62 0 1 0 200 21572 2876 915680 0 0 44728 60 30070 3142 1 43 56 0 1 0 200 143944 2876 796260 0 0 43336 0 29704 3064 1 44 51 6 1 0 200 99132 2876 841268 0 0 45056 0 30130 3062 0 42 58 0 1 0 200 62292 2876 877832 0 0 36864 0 23757 2468 1 34 66 0 1 0 200 19332 2876 921140 0 0 43008 0 29924 3073 0 42 57 0 I've never seen wait_max go higher than 9 as of yet. Let me know if I can provide any more useful information. --David Madsen - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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