Date: Wed, 10 Mar 2021 13:07:15 +0300 From: Mamontov Roman <mr.xanto@gmail.com> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Troubles with netdump(4) Message-ID: <1903978782.20210310130715@gmail.com>
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Hello.
I try to use netdump(4) option for transmitting kernel dumps to a remote server.
When I caused a kernel panic by sysctl debug.kdb.panic I found, that netdumping
to remote server happens very slow: systat -ifstat on remote side show speed
around 5KB/s.
On netdump-client side I have:
root@host-1:/home/roman # uname -mv
FreeBSD 12.2-STABLE GENERIC amd64
root@host-1:/home/roman #
root@host-1:/home/roman # dumpon -l
em0
root@host-1:/home/roman # cat /etc/rc.local
#!/bin/sh
/sbin/dumpon -c 192.168.7.11 -s 192.168.7.12 em0
root@host-1:/home/roman # ifconfig em0
em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=81209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER>
inet 192.168.7.11 netmask 0xffffff00 broadcast 192.168.7.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
root@solution:/home/roman #
On netdumpd-side:
root@host-2:/home/roman # uname -mv
FreeBSD 12.2-STABLE GENERIC i386
root@host-2:/home/roman # ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=81209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER>
inet 192.168.7.12 netmask 0xffffff00 broadcast 192.168.7.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
root@solution-old:/home/roman #
Both (host-1 and host-2) have the same stable/12 revision:
# cat /usr/src/.gituprevision
stable/12:879039312
#
When I try test network bandwith between host-1 and host-2 with iperf3, I see
next results:
root@host-1:/home/roman # iperf3 -u -b 0 -c 192.168.7.12
Connecting to host 192.168.7.12, port 5201
[ 5] local 192.168.7.11 port 37112 connected to 192.168.7.12 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 346 MBytes 2.90 Gbits/sec 248710
[ 5] 1.00-2.00 sec 345 MBytes 2.89 Gbits/sec 247750
[ 5] 2.00-3.00 sec 345 MBytes 2.90 Gbits/sec 247990
[ 5] 3.00-4.00 sec 331 MBytes 2.78 Gbits/sec 238020
[ 5] 4.00-5.00 sec 262 MBytes 2.20 Gbits/sec 188260
[ 5] 5.00-6.00 sec 345 MBytes 2.89 Gbits/sec 247560
[ 5] 6.00-7.00 sec 345 MBytes 2.89 Gbits/sec 247660
[ 5] 7.00-8.00 sec 345 MBytes 2.90 Gbits/sec 247980
[ 5] 8.00-9.00 sec 342 MBytes 2.87 Gbits/sec 245760
[ 5] 9.00-10.00 sec 344 MBytes 2.88 Gbits/sec 246830
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 3.27 GBytes 2.81 Gbits/sec 0.000 ms 0/2406520 (0%) sender
[ 5] 0.00-10.07 sec 0.00 Bytes 0.00 bits/sec 0.000 ms 0/0 (0%) receiver
iperf Done.
root@host-1:/home/roman #
Capturing traffic between host-1 and host-2 not show anything criminal (as I
understand).
Next I try netdumping to another FreeBSD-host (virtual machine on VMWare
hypervisor):
root@host-3:~ # uname -mv
FreeBSD 12.2-STABLE r369412 GENERIC amd64
root@host-3:~ # ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=81009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER>
inet 192.168.7.18 netmask 0xffffff00 broadcast 192.168.7.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
root@host-3:~ #
And netdumping to this host are still slow (~the same 5KB/s).
Next step another FreeBSD-host (virtual machine on VirtualBox hypevisor):
root@host-4:~ # uname -mv
FreeBSD 12.2-STABLE r369412 GENERIC amd64
root@host-4:~ # ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=81009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER>
inet 192.168.7.19 netmask 0xffffff00 broadcast 192.168.7.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
root@host-4:~ #
Both (host-3 and host-4) are installed from FreeBSD-12.2-STABLE-amd64-20210304-r369412-bootonly.iso
When I caused a kernel panic by sysctl debug.kdb.panic on host-4, netdumping to
host-3 show the same 5 KB/s.
Is there an particularity in netdump, that can't transmitting crash dumps over
network faster than 5KB/s? Or this is a "feature" of my test-suite?
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