Date: Tue, 21 Mar 2017 22:52:02 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Gleb Smirnoff <glebius@FreeBSD.org> Cc: John Baldwin <jhb@freebsd.org>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r315662 - in head: contrib/bsnmp/snmp_mibII contrib/ipfilter/ipsend lib/libprocstat sys/netinet sys/sys usr.bin/netstat usr.bin/sockstat usr.bin/systat usr.sbin/tcpdrop usr.sbin/trpt Message-ID: <20170321195202.GF86500@zxy.spb.ru> In-Reply-To: <20170321185004.GW23308@FreeBSD.org> References: <201703210639.v2L6dnRf055522@repo.freebsd.org> <1782817.djIc6TfI1t@ralph.baldwin.cx> <20170321185004.GW23308@FreeBSD.org>
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On Tue, Mar 21, 2017 at 11:50:04AM -0700, Gleb Smirnoff wrote: > John, > > On Tue, Mar 21, 2017 at 10:40:34AM -0700, John Baldwin wrote: > J> First, this is a very good change and long overdue in divorcing the > J> user-facing structure for live system reporting vs the kernel structure. > J> > J> However, I realize you don't use info from netstat when debugging kernel > J> crash dumps, but other people _do_. It's ok if the kvm bits of netstat > J> require a matching kernel and thus require recompiling everytime the ABI > J> changes, but it is useful to have them. Please restore those. > > I have very much anticipated this comment from you, John. > > I would like to remind you, that we have had this very exact conversation > back when I removed kvm support from netstat/route.c. Let me search the > archives: > > https://lists.freebsd.org/pipermail/svn-src-head/2015-April/070480.html > > This conversation has had a continuation on IRC, which I don't archive. > > AFAIR, first I told that with all my involvement into networking stack, > I never ever had experienced a need to run route stats on a core. The > debugger were the only useful tool. And that opinion was seconded by > other network hackers. Then we discussed that a proper tool chould use > dynamic type parsing and not kvm(3). You said that future gdb has python > scripting and that would work fine. Meanwhile, you insisted that I restore > the functionality. I resisted to put kvm(3) back into netstat/route.c, and > instead I created a gdb script that prints exactly what 'nestat -anr -M core' > prints. And I committed the script just to satisfy your demand: > > tools/debugscripts/netstat-anr.gdb > > Can you please fairly answer, have you (or anyone else) ever used the > script during these 2 years? > > I believe, the inpcb/tcpcb printing from a core functionality has the > same level of real usefulness. I could create the same script for pcbs, > and I am afraid it is going to share fate of netstat-anr.gdb. How long run this script for core file w/ 40K TCP connections?
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