On Tue, Mar 21, 2017 at 01:40:22PM -0700, Gleb Smirnoff wrote:

> On Tue, Mar 21, 2017 at 10:52:02PM +0300, Slawa Olhovchenkov wrote:
> S> > On Tue, Mar 21, 2017 at 10:40:34AM -0700, John Baldwin wrote:
> S> > J> First, this is a very good change and long overdue in divorcing the
> S> > J> user-facing structure for live system reporting vs the kernel 
> structure.
> S> > J> 
> S> > J> However, I realize you don't use info from netstat when debugging 
> kernel
> S> > J> crash dumps, but other people _do_.  It's ok if the kvm bits of 
> netstat
> S> > J> require a matching kernel and thus require recompiling everytime the 
> ABI
> S> > J> changes, but it is useful to have them.  Please restore those.
> S> > 
> S> > I have very much anticipated this comment from you, John.
> S> > 
> S> > I would like to remind you, that we have had this very exact conversation
> S> > back when I removed kvm support from netstat/route.c. Let me search the
> S> > archives:
> S> > 
> S> > https://lists.freebsd.org/pipermail/svn-src-head/2015-April/070480.html
> S> > 
> S> > This conversation has had a continuation on IRC, which I don't archive.
> S> > 
> S> > AFAIR, first I told that with all my involvement into networking stack,
> S> > I never ever had experienced a need to run route stats on a core. The
> S> > debugger were the only useful tool. And that opinion was seconded by
> S> > other network hackers. Then we discussed that a proper tool chould use
> S> > dynamic type parsing and not kvm(3). You said that future gdb has python
> S> > scripting and that would work fine. Meanwhile, you insisted that I 
> restore
> S> > the functionality. I resisted to put kvm(3) back into netstat/route.c, 
> and
> S> > instead I created a gdb script that prints exactly what 'nestat -anr -M 
> core'
> S> > prints. And I committed the script just to satisfy your demand:
> S> > 
> S> > tools/debugscripts/netstat-anr.gdb
> S> > 
> S> > Can you please fairly answer, have you (or anyone else) ever used the
> S> > script during these 2 years?
> S> > 
> S> > I believe, the inpcb/tcpcb printing from a core functionality has the
> S> > same level of real usefulness. I could create the same script for pcbs,
> S> > and I am afraid it is going to share fate of netstat-anr.gdb.
> S> 
> S> How long run this script for core file w/ 40K TCP connections?
> 
> You tell me. When I analyze cores, I don't read through 40K TCP connections.

Real, frech core:

# grep netstat /var/crash/core.txt.3
netstat -s
netstat -m
netstat: memstat_kvm_all: invalid address (0x0)
netstat -anA
netstat -aL
# grep -c tcp4 /var/crash/core.txt.3
38172

This created automaticly at reboot and boot paused until core.txt
created.
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