Date: Fri, 12 Apr 1996 10:19:54 -0400 From: Garrett Wollman <wollman@lcs.mit.edu> To: Nathan Stratton <nathan@netrail.net> Cc: freebsd-questions@FreeBSD.ORG Subject: What is the max network IO on a FreeBSD box? (fwd) Message-ID: <9604121419.AA23568@halloran-eldar.lcs.mit.edu> In-Reply-To: <Pine.LNX.3.92.960411184423.16427E-100000@netrail.net> References: <Pine.LNX.3.92.960411184423.16427E-100000@netrail.net>
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<<On Thu, 11 Apr 1996 18:44:37 -0400 (EDT), Nathan Stratton <nathan@netrail.net> said:
> Hi, I am using FreeBSD boxes as routers with Emerging Tech T1 cards. I
> connect them together with 10 Base T, but want to move up to 100 Meg FDDI
> cards. If I put 2 cards in each router, can I shove +100 meg through a P160
> running FreeBSD?
It depends on how big the packets are. If you look at the performance
curve for any packet transmission test, it looks a lot like the one in
the enclosed PostScript graph: there's a region where the performance
is local-CPU-bound, and there's a region where the performance is
bound by the wire speed. If you get WAY out to the end of the curve,
where every packet is close to the MTU, you can generate about 75
Mbit/s in my experiments.
The graph should packet generation rates; as a general rule, packet
forwarding is a lot cheaper than packet generation or reception; my
P133 is straining mightily to generate 55000 packets per second out
the discard and with UDP checksums disabled. The IP forwarding path
should be somewhat cheaper, although this is balanced by the fact that
you need to receive the packets in addition to sending them. (The
green `theoretical' line in the graph is somewhat suspect as we
couldn't find any references for the Fast Ethernet IPG and preamble
lengths.) I am presently employed in finding ways to make all aspects
of packet handling faster.
-GAWollman
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5820 2324 A
5839 2386 A
5858 2380 A
5877 2272 A
5896 2383 A
5916 2378 A
5935 2378 A
5954 2310 A
5973 2361 A
5992 2328 A
6011 2385 A
6030 2316 A
6050 2361 A
6069 2309 A
6088 2379 A
6107 2288 A
6126 2304 A
6145 2310 A
6165 2341 A
6184 2292 A
6203 2340 A
6222 2274 A
6241 2379 A
6260 2284 A
6279 2349 A
6299 2299 A
6318 2357 A
6337 2277 A
6356 2369 A
6375 2270 A
6394 2371 A
6414 2261 A
6433 2314 A
6452 2280 A
6471 2346 A
6490 2248 A
6509 2404 A
6528 2280 A
6548 2349 A
6567 2233 A
6586 2304 A
LT3
6486 4206 M
(discard \(polled free\)) Rshow
6654 4206 B
859 3131 B
878 3014 B
897 3106 B
917 3185 B
936 3050 B
955 3087 B
974 3067 B
993 3165 B
1012 3079 B
1032 3050 B
1051 2995 B
1070 3109 B
1089 3047 B
1108 3037 B
1127 3067 B
1146 3166 B
1166 3015 B
1185 2990 B
1204 2990 B
1223 3021 B
1242 3031 B
1261 3022 B
1281 2990 B
1300 3094 B
1319 2926 B
1338 3008 B
1357 2902 B
1376 3035 B
1395 2862 B
1415 2938 B
1434 2898 B
1453 2998 B
1472 2931 B
1491 2971 B
1510 2896 B
1530 2965 B
1549 2929 B
1568 2953 B
1587 2934 B
1606 3042 B
1625 2936 B
1644 3019 B
1664 2860 B
1683 2955 B
1702 2919 B
1721 2919 B
1740 2882 B
1759 3022 B
1779 2879 B
1798 2864 B
1817 2870 B
1836 2929 B
1855 2877 B
1874 2903 B
1893 2886 B
1913 2906 B
1932 2883 B
1951 2916 B
1970 2837 B
1989 2916 B
2008 2871 B
2027 2881 B
2047 2775 B
2066 2982 B
2085 2854 B
2104 2854 B
2123 2847 B
2142 2911 B
2162 2851 B
2181 2882 B
2200 2841 B
2219 2939 B
2238 2828 B
2257 2849 B
2276 2782 B
2296 2908 B
2315 2828 B
2334 2878 B
2353 2792 B
2372 2972 B
2391 2739 B
2411 2775 B
2430 2797 B
2449 2867 B
2468 2792 B
2487 2804 B
2506 2800 B
2525 2911 B
2545 2798 B
2564 2842 B
2583 2740 B
2602 2841 B
2621 2782 B
2640 2802 B
2660 2717 B
2679 2876 B
2698 2759 B
2717 2781 B
2736 2745 B
2755 2828 B
2774 2739 B
2794 2798 B
2813 2766 B
2832 2880 B
2851 2816 B
2870 2792 B
2889 2711 B
2909 2796 B
2928 2769 B
2947 2799 B
2966 2681 B
2985 2879 B
3004 2704 B
3023 2707 B
3043 2670 B
3062 2754 B
3081 2734 B
3100 2766 B
3119 2719 B
3138 2829 B
3158 2704 B
3177 2746 B
3196 2676 B
3215 2742 B
3234 2669 B
3253 2707 B
3272 2657 B
3292 2758 B
3311 2693 B
3330 2679 B
3349 2636 B
3368 2711 B
3387 2695 B
3407 2727 B
3426 2675 B
3445 2779 B
3464 2676 B
3483 2708 B
3502 2619 B
3521 2682 B
3541 2613 B
3560 2689 B
3579 2573 B
3598 2736 B
3617 2599 B
3636 2663 B
3656 2578 B
3675 2728 B
3694 2563 B
3713 2640 B
3732 2631 B
3751 2750 B
3770 2632 B
3790 2664 B
3809 2592 B
3828 2660 B
3847 2625 B
3866 2659 B
3885 2610 B
3905 2712 B
3924 2633 B
3943 2640 B
3962 2599 B
3981 2686 B
4000 2577 B
4019 2658 B
4039 2611 B
4058 2721 B
4077 2605 B
4096 2670 B
4115 2516 B
4134 2650 B
4153 2616 B
4173 2601 B
4192 2599 B
4211 2702 B
4230 2587 B
4249 2611 B
4268 2537 B
4288 2632 B
4307 2513 B
4326 2619 B
4345 2516 B
4364 2684 B
4383 2573 B
4402 2600 B
4422 2533 B
4441 2597 B
4460 2585 B
4479 2545 B
4498 2563 B
4517 2659 B
4537 2546 B
4556 2547 B
4575 2549 B
4594 2580 B
4613 2528 B
4632 2519 B
4651 2553 B
4671 2615 B
4690 2501 B
4709 2559 B
4728 2481 B
4747 2561 B
4766 2568 B
4786 2551 B
4805 2526 B
4824 2606 B
4843 2519 B
4862 2497 B
4881 2518 B
4900 2554 B
4920 2520 B
4939 2543 B
4958 2483 B
4977 2610 B
4996 2518 B
5015 2538 B
5035 2476 B
5054 2503 B
5073 2523 B
5092 2503 B
5111 2498 B
5130 2557 B
5149 2473 B
5169 2467 B
5188 2446 B
5207 2512 B
5226 2462 B
5245 2501 B
5264 2455 B
5284 2557 B
5303 2429 B
5322 2483 B
5341 2349 B
5360 2493 B
5379 2474 B
5398 2464 B
5418 2482 B
5437 2555 B
5456 2444 B
5475 2458 B
5494 2426 B
5513 2487 B
5533 2417 B
5552 2490 B
5571 2419 B
5590 2510 B
5609 2420 B
5628 2489 B
5647 2425 B
5667 2450 B
5686 2434 B
5705 2463 B
5724 2435 B
5743 2513 B
5762 2415 B
5782 2427 B
5801 2480 B
5820 2440 B
5839 2434 B
5858 2443 B
5877 2424 B
5896 2500 B
5916 2428 B
5935 2447 B
5954 2401 B
5973 2446 B
5992 2425 B
6011 2408 B
6030 2417 B
6050 2468 B
6069 2352 B
6088 2346 B
6107 2398 B
6126 2433 B
6145 2391 B
6165 2393 B
6184 2403 B
6203 2444 B
6222 2399 B
6241 2420 B
6260 2367 B
6279 2425 B
6299 2410 B
6318 2402 B
6337 2401 B
6356 2433 B
6375 2365 B
6394 2396 B
6414 2422 B
6433 2419 B
6452 2380 B
6471 2392 B
6490 2367 B
6509 2447 B
6528 2348 B
6548 2394 B
6567 2353 B
6586 2385 B
LT4
6486 4066 M
(discard \(no UDP checksum\)) Rshow
6654 4066 C
859 3827 C
878 3776 C
897 3723 C
917 3735 C
936 3649 C
955 3717 C
974 3752 C
993 3864 C
1012 3753 C
1032 3669 C
1051 3737 C
1070 3712 C
1089 3786 C
1108 3840 C
1127 3832 C
1146 3709 C
1166 3720 C
1185 3698 C
1204 3826 C
1223 3725 C
1242 3787 C
1261 3756 C
1281 3750 C
1300 3785 C
1319 3846 C
1338 3779 C
1357 3700 C
1376 3689 C
1395 3778 C
1415 3829 C
1434 3710 C
1453 3731 C
1472 3747 C
1491 3693 C
1510 3760 C
1530 3644 C
1549 3760 C
1568 3696 C
1587 3721 C
1606 3761 C
1625 3699 C
1644 3745 C
1664 3753 C
1683 3714 C
1702 3698 C
1721 3787 C
1740 3736 C
1759 3857 C
1779 3756 C
1798 3715 C
1817 3625 C
1836 3741 C
1855 3734 C
1874 3695 C
1893 3867 C
1913 3686 C
1932 3750 C
1951 3689 C
1970 3697 C
1989 3742 C
2008 3818 C
2027 3735 C
2047 3788 C
2066 3781 C
2085 3716 C
2104 3818 C
2123 3789 C
2142 3751 C
2162 3733 C
2181 3634 C
2200 3863 C
2219 3870 C
2238 3695 C
2257 3731 C
2276 3715 C
2296 3654 C
2315 3702 C
2334 3795 C
2353 3744 C
2372 3730 C
2391 3746 C
2411 3768 C
2430 3727 C
2449 3743 C
2468 3723 C
2487 3749 C
2506 3783 C
2525 3760 C
2545 3715 C
2564 3557 C
2583 3770 C
2602 3758 C
2621 3680 C
2640 3737 C
2660 3687 C
2679 3691 C
2698 3667 C
2717 3791 C
2736 3726 C
2755 3729 C
2774 3853 C
2794 3690 C
2813 3808 C
2832 3677 C
2851 3702 C
2870 3718 C
2889 3682 C
2909 3689 C
2928 3701 C
2947 3802 C
2966 3790 C
2985 3793 C
3004 3715 C
3023 3842 C
3043 3814 C
3062 3817 C
3081 3771 C
3100 3726 C
3119 3725 C
3138 3781 C
3158 3709 C
3177 3758 C
3196 3728 C
3215 3698 C
3234 3784 C
3253 3730 C
3272 3757 C
3292 3679 C
3311 3796 C
3330 3729 C
3349 3719 C
3368 3691 C
3387 3683 C
3407 3812 C
3426 3772 C
3445 3777 C
3464 3605 C
3483 3709 C
3502 3672 C
3521 3745 C
3541 3711 C
3560 3705 C
3579 3852 C
3598 3824 C
3617 3675 C
3636 3727 C
3656 3562 C
3675 3701 C
3694 3746 C
3713 3610 C
3732 3707 C
3751 3674 C
3770 3617 C
3790 3643 C
3809 3642 C
3828 3700 C
3847 3718 C
3866 3553 C
3885 3757 C
3905 3712 C
3924 3702 C
3943 3776 C
3962 3704 C
3981 3708 C
4000 3719 C
4019 3686 C
4039 3751 C
4058 3777 C
4077 3707 C
4096 3667 C
4115 3788 C
4134 3779 C
4153 3723 C
4173 3695 C
4192 3647 C
4211 3636 C
4230 3686 C
4249 3697 C
4268 3680 C
4288 3742 C
4307 3813 C
4326 3694 C
4345 3592 C
4364 3661 C
4383 3662 C
4402 3706 C
4422 3567 C
4441 3605 C
4460 3763 C
4479 3615 C
4498 3752 C
4517 3671 C
4537 3672 C
4556 3813 C
4575 3698 C
4594 3751 C
4613 3756 C
4632 3645 C
4651 3687 C
4671 3715 C
4690 3668 C
4709 3701 C
4728 3592 C
4747 3621 C
4766 3606 C
4786 3612 C
4805 3856 C
4824 3764 C
4843 3662 C
4862 3669 C
4881 3581 C
4900 3684 C
4920 3808 C
4939 3640 C
4958 3657 C
4977 3613 C
4996 3788 C
5015 3676 C
5035 3616 C
5054 3619 C
5073 3613 C
5092 3627 C
5111 3814 C
5130 3779 C
5149 3676 C
5169 3768 C
5188 3640 C
5207 3683 C
5226 3726 C
5245 3655 C
5264 3710 C
5284 3678 C
5303 3698 C
5322 3675 C
5341 3700 C
5360 3656 C
5379 3673 C
5398 3639 C
5418 3678 C
5437 3768 C
5456 3703 C
5475 3597 C
5494 3625 C
5513 3775 C
5533 3738 C
5552 3675 C
5571 3595 C
5590 3713 C
5609 3680 C
5628 3751 C
5647 3620 C
5667 3593 C
5686 3632 C
5705 3763 C
5724 3815 C
5743 3722 C
5762 3693 C
5782 3872 C
5801 3669 C
5820 3653 C
5839 3658 C
5858 3650 C
5877 3767 C
5896 3694 C
5916 3762 C
5935 3668 C
5954 3559 C
5973 3693 C
5992 3740 C
6011 3644 C
6030 3726 C
6050 3623 C
6069 3752 C
6088 3720 C
6107 3707 C
6126 3692 C
6145 3787 C
6165 3664 C
6184 3808 C
6203 3688 C
6222 3670 C
6241 3740 C
6260 3609 C
6279 3669 C
6299 3678 C
6318 3663 C
6337 3687 C
6356 3700 C
6375 3658 C
6394 3736 C
6414 3618 C
6433 3765 C
6452 3759 C
6471 3600 C
6490 3583 C
6509 3649 C
6528 3685 C
6548 3736 C
6567 3566 C
6586 3711 C
6777 3660 C
6969 3573 C
stroke
grestore
end
showpage
%%Trailer
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