Date: Thu, 24 Jul 1997 00:28:53 -0500 (CDT) From: "Jo, SanKu" <skjo@jumprun.tamu.edu> To: freebsd-hackers@freebsd.org Subject: VIF : the bandwidth taken by multicasting packet (fwd) Message-ID: <Pine.SOL.3.96.970724002803.9583B-100000@jumprun.tamu.edu>
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Howdy !
Because I hope to check the Bandwidth taken by the IP multicastingrouter(FreeBSD box),
I tried to use iotcl(Channel_descriptor, SIOCGETVIFCNT, struct *sioc_vif_req).
I heard this function retruns the input and output Bandwidth.
There are two cases for testing.
1. When Host-A is source and Host-B is receiver, the Bandwidth rate value
returned by the function is correct.
2. When Host-B is source and Host-A is receiver, the Bandwidth rate value(out_bytes)
retruned by the function is wrong.
Even the case witout any receiver in Backbone(as Host-A), the function
returns the whole bandwidth rate(in_bytes) which is taken by the source, HOST-B.
I think the prune function is all right.
Below is my configuration with multicast routers denoted
by asterisks:
======++=====BackBOne <--in
|| -->out
|| HOST-A VIF Research Subnet HOST-B
------++---------- --------------------- || ----------
|sparc* | ethernet | freebsd 2.1 * | || |sparc |
| 128.194.169.93 |-----------|169.53 166.4 |---++-------| 166.5 |
| 3.8 | | 3.3 | || | |
------------------ --------------------- || ----------
Its' default gateway is freebsd
How can I get correct bandwidth for the second case ?
Is it possible or not to get it ?
And where can I get some information for hacking the multicasting function in FreeBSD ?
Any comment will be very appreciated.
Thank you for your kind attention !
Best regards,
Jo, SanKu
Texas A&M University.
Http://ee.tamu.edu/~skjo
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