> On 10 Mar 2021, at 10:07, Mamontov Roman <mr.xanto at gmail.com>
wrote:
>
> 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 at host-1:/home/roman # uname -mv
> FreeBSD 12.2-STABLE GENERIC amd64
> root at host-1:/home/roman #
> root at host-1:/home/roman # dumpon -l
> em0
> root at host-1:/home/roman # cat /etc/rc.local
> #!/bin/sh
> /sbin/dumpon -c 192.168.7.11 -s 192.168.7.12 em0
> root at 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 at solution:/home/roman #
>
> On netdumpd-side:
> root at host-2:/home/roman # uname -mv
> FreeBSD 12.2-STABLE GENERIC i386
> root at 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 at 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 at 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 at 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 at host-3:~ # uname -mv
> FreeBSD 12.2-STABLE r369412 GENERIC amd64
> root at 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 at 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 at host-4:~ # uname -mv
> FreeBSD 12.2-STABLE r369412 GENERIC amd64
> root at 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 at 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.
netdump requires explicit acks from the other side.
Could you try dumping the exchange between the dumping host and the server to
verify that acks are sent immediately after receiving the next
chunk?>
> 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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