Re: Proposed patch to the kernel and to netstat...

[Bruce M. Simpson]

[EMAIL PROTECTED] wrote:

...
Please email me comments.  I'd like to commit this to HEAD soon.  It
can't be put into 7 without removing the cluster and mbuf counting,
but I might do that as well if there is interest.
  


People writing servers are going to find the watermark stuff useful. I'm 
thinking being able to watch the the buffer stats (possibly also in a 
way which we can graph) for a single socket, given its inpcb or so 
address, would also be a neat trick...


cheers
BMS
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Proposed patch to the kernel and to netstat...

[gnn]

Howdy,

I have developed the attached patch which extends the functionality of
netstat (via the -x flag) to show us all the socket buffer
statistics.  The kernel change counts mbufs, as well as clusters (at
the moment of any size) and gives output like this:

Proto Recv-Q Send-Q  Local Address  Foreign Address   R-MBUF S-MBUF 
R-CLUS S-CLUS R-HIWA S-HIWA R-LOWA S-LOWA R-BCNT S-BCNT R-BMAX S-BMAX (state)
tcp4   0  0 127.0.0.1.6010 *.* 0  0 
 0  0  65536  32768  1   2048  0  0 262144 262144 LISTEN
tcp6   0  0 ::1.6010   *.* 0  0 
 0  0  65536  32768  1   2048  0  0 262144 262144 LISTEN
tcp4   0  0 172.16.186.130.22  172.16.186.1.53443  0  0 
 0  0  66608  33304  1   2048  0  0 262144 262144 
ESTABLISHED
tcp4   0  0 172.16.186.130.29178   172.16.186.1.22 0  0 
 0  0  0  0  0  0  0  0  0  0 TIME_WAIT
tcp4   0  0 172.16.186.130.62302   69.147.83.41.22 0  0 
 0  0  65700  74540  1   2048  0  0 262144 262144 
ESTABLISHED
tcp4   0  0 127.0.0.1.62415127.0.0.1.6010  0  0 
 0  0  0  0  0  0  0  0  0  0 TIME_WAIT


Note you need a very wide screen  to read that.

The man page is also updated but the relevant bits are:

 The -x flag causes netstat to output all the information recorded about
 data stored in the socket buffers.  The fields are:

 R-MBUFNumber of mbufs in the receive queue.
 S-MBUFNumber of mbufs in the send queue.
 R-CLUSNumber of clusters, of any type, in the recieve queue.
 S-CLUSNumber of clusters, of any type, in the send queue.
 R-HIWAReceive buffer high water mark, in bytes.
 S-HIWASend buffer high water mark, in bytes.
 R-LOWAReceive buffer low water mark, in bytes.
 S-LOWASend buffer low water mark, in bytes.
 R-BCNTReceive buffer byte count.
 S-BCNTSend buffer byte count.
 R-BMAXMaximum bytes that can be used in the receive buffer.
 S-BMAXMaximum bytes that can be used in the send buffer.


Please email me comments.  I'd like to commit this to HEAD soon.  It
can't be put into 7 without removing the cluster and mbuf counting,
but I might do that as well if there is interest.

Best,
George



netstat.diff
Description: Binary data
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