W dniu 16.03.2021 o 12:50, tue...@freebsd.org pisze: >> On 16. Mar 2021, at 11:55, Blake Hartshorn <cont...@blakehartshorn.com> >> wrote: >> >> Hi Michael, >> >> I've attached tcpdumps for port 80 on both sides of a bad transfer, using 2 >> VMs in the same datacenter, FreeBSD 13 serving and 12 as a client. A friend >> of mine suggested I also run some tests with iperf3, so pasting those >> results below. You'll see it going fast in one direction and crawling in the >> other on TCP. There's also some disparity on UDP. > The problem is that the server provides TCP segments larger than the MTU > to the NIC. These are dropped and needs to be retransmitted. That is why > it takes so long. So I guess TSO is enabled on the NIC and not working > correctly. > > What is the output of ifconfig? Can you disable TSO? Does that work around > the problem? > > Best regards > Michael >> >> TCP: >> [ ID][Role] Interval Transfer Bitrate Retr Cwnd >> [ 5][TX-C] 0.00-1.00 sec 27.7 MBytes 233 Mbits/sec 342 26.7 >> KBytes >> [ 7][RX-C] 0.00-1.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 1.00-2.00 sec 15.8 MBytes 132 Mbits/sec 249 52.0 >> KBytes >> [ 7][RX-C] 1.00-2.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 2.00-3.00 sec 13.7 MBytes 115 Mbits/sec 307 15.4 >> KBytes >> [ 7][RX-C] 2.00-3.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 3.00-4.00 sec 14.5 MBytes 121 Mbits/sec 260 22.4 >> KBytes >> [ 7][RX-C] 3.00-4.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 4.00-5.00 sec 14.3 MBytes 120 Mbits/sec 240 37.9 >> KBytes >> [ 7][RX-C] 4.00-5.00 sec 5.58 KBytes 45.7 Kbits/sec >> [ 5][TX-C] 5.00-6.00 sec 17.7 MBytes 149 Mbits/sec 363 15.4 >> KBytes >> [ 7][RX-C] 5.00-6.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 6.00-7.00 sec 14.8 MBytes 124 Mbits/sec 287 8.38 >> KBytes >> [ 7][RX-C] 6.00-7.00 sec 5.58 KBytes 45.7 Kbits/sec >> [ 5][TX-C] 7.00-8.00 sec 14.7 MBytes 123 Mbits/sec 293 28.1 >> KBytes >> [ 7][RX-C] 7.00-8.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 8.00-9.00 sec 11.9 MBytes 100 Mbits/sec 325 18.3 >> KBytes >> [ 7][RX-C] 8.00-9.00 sec 4.18 KBytes 34.3 Kbits/sec >> [ 5][TX-C] 9.00-10.00 sec 14.3 MBytes 120 Mbits/sec 315 39.3 >> KBytes >> [ 7][RX-C] 9.00-10.00 sec 4.18 KBytes 34.3 Kbits/sec >> - - - - - - - - - - - - - - - - - - - - - - - - - >> [ ID][Role] Interval Transfer Bitrate Retr >> [ 5][TX-C] 0.00-10.00 sec 159 MBytes 134 Mbits/sec 2981 >> sender >> [ 5][TX-C] 0.00-10.00 sec 159 MBytes 134 Mbits/sec >> receiver >> [ 7][RX-C] 0.00-10.00 sec 77.0 KBytes 63.1 Kbits/sec 65 >> sender >> [ 7][RX-C] 0.00-10.00 sec 44.6 KBytes 36.6 Kbits/sec >> receiver >> ----------------------------------------------------------------------------------------------------------- >> >> >> UDP: >> [ ID][Role] Interval Transfer Bitrate Jitter >> Lost/Total Datagrams >> [ 5][TX-C] 0.00-1.00 sec 81.6 MBytes 685 Mbits/sec 67798 >> [ 7][RX-C] 0.00-1.00 sec 8.80 MBytes 73.8 Mbits/sec 0.255 ms >> 54070/60475 (89%) >> [ 5][TX-C] 1.00-2.00 sec 72.7 MBytes 610 Mbits/sec 64802 >> [ 7][RX-C] 1.00-2.00 sec 8.52 MBytes 71.5 Mbits/sec 0.154 ms >> 68912/75116 (92%) >> [ 5][TX-C] 2.00-3.00 sec 73.7 MBytes 618 Mbits/sec 64158 >> [ 7][RX-C] 2.00-3.00 sec 8.52 MBytes 71.5 Mbits/sec 0.276 ms >> 67738/73945 (92%) >> [ 5][TX-C] 3.00-4.00 sec 76.6 MBytes 643 Mbits/sec 63521 >> [ 7][RX-C] 3.00-4.00 sec 8.55 MBytes 71.8 Mbits/sec 0.160 ms >> 68647/74874 (92%) >> [ 5][TX-C] 4.00-5.00 sec 76.1 MBytes 638 Mbits/sec 64614 >> [ 7][RX-C] 4.00-5.00 sec 8.55 MBytes 71.7 Mbits/sec 0.461 ms >> 67542/73767 (92%) >> [ 5][TX-C] 5.00-6.00 sec 75.9 MBytes 637 Mbits/sec 64834 >> [ 7][RX-C] 5.00-6.00 sec 8.57 MBytes 71.9 Mbits/sec 0.297 ms >> 71565/77806 (92%) >> [ 5][TX-C] 6.00-7.00 sec 73.0 MBytes 613 Mbits/sec 63639 >> [ 7][RX-C] 6.00-7.00 sec 8.40 MBytes 70.5 Mbits/sec 0.199 ms >> 69545/75663 (92%) >> [ 5][TX-C] 7.00-8.00 sec 74.6 MBytes 626 Mbits/sec 65030 >> [ 7][RX-C] 7.00-8.00 sec 8.78 MBytes 73.6 Mbits/sec 0.254 ms >> 67173/73566 (91%) >> [ 5][TX-C] 8.00-9.00 sec 75.0 MBytes 629 Mbits/sec 64848 >> [ 7][RX-C] 8.00-9.00 sec 8.77 MBytes 73.5 Mbits/sec 0.298 ms >> 70932/77315 (92%) >> [ 5][TX-C] 9.00-10.00 sec 74.5 MBytes 625 Mbits/sec 64487 >> [ 7][RX-C] 9.00-10.00 sec 8.71 MBytes 73.1 Mbits/sec 0.185 ms >> 68268/74612 (91%) >> - - - - - - - - - - - - - - - - - - - - - - - - - >> [ ID][Role] Interval Transfer Bitrate Jitter >> Lost/Total Datagrams >> [ 5][TX-C] 0.00-10.00 sec 754 MBytes 632 Mbits/sec 0.000 ms >> 0/647731 (0%) sender >> [ 5][TX-C] 0.00-10.12 sec 105 MBytes 87.2 Mbits/sec 0.245 ms >> 571090/647649 (88%) receiver >> [ 7][RX-C] 0.00-10.00 sec 1009 MBytes 846 Mbits/sec 0.000 ms >> 0/761013 (0%) sender >> [ 7][RX-C] 0.00-10.12 sec 86.2 MBytes 71.4 Mbits/sec 0.185 ms >> 674392/737139 (91%) receiver >> >>
Taking a look at this iperf output I recalled that 80% of my setups
suffered from similar issue after transitioning from 1{1,2}-STABLE to
13-STABLE about a mounth ago. I have asked on IRC but nobody confirmed
similar problems so I have reduced MTU to 8900 from the original 9000 on
some vlan(4) interfaces to solve the issue. I am using mostly vlan(4)s
over LACP lagg(4)s created on NICs. So far (for FreeBSD 11 and 12)
setting MTU 9000 on physical NIC was sufficient to make it work, now I
have set MTU 9000 on NICs and reduced MTU 8900 on vlan(4)s.
>>
>>
>> On Tuesday, March 16, 2021 4:16:15 AM EDT tue...@freebsd.org wrote:
>>>> On 15. Mar 2021, at 12:56, Blake Hartshorn <cont...@blakehartshorn.com>
>>>> wrote:
>>>>
>>>> The short version, when I use FreeBSD 13, delivering data can take 5
>>>> minutes for 1MB over SSH or HTTP when using IPv6. This problem does not
>>>> happen with IPv4. I installed FreeBSD 12 and Linux on that same device,
>>>> neither had the problem.
>>>>
>>>> Did some troubleshooting with Linode, have ultimately ruled the network
>>>> itself out at this point. When the server is on FreeBSD 13, it can
>>>> download quickly over IPv6, but not deliver. Started investigating after
>>>> noticing my SSH session was lagging when cat'ing large files or running
>>>> builds. This problem even occurs between VMs in the same datacenter. I
>>>> generated a 1MB file of base64 garbage served by nginx for testing. IPv6
>>>> is being configured by SLAAC and on both 12 and 13 installs was setup by
>>>> the installer. Linode uses Linux/KVM hosts for their virtual machines so
>>>> it's running on that virtual adapter.
>>>>
>>>> I asked on the forums, another user recommended going to the mailing lists
>>>> instead. Does anyone know if config settings need to be different on 13?
>>>> Did I maybe just find a real issue? I can provide any requested details.
>>>> Thanks!
>>> Could you prove a .pcap tracefile, one from the sender, one from the
>>> recevier, of
>>> a TCP/IPv6 connection, which doesn't work as expected. For example, use
>>> your 1MB
>>> base64 garbage transfer.
>>>
>>> Best regardes
>>> Michael
>>>>
>>>>
>>>> _______________________________________________
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>>>
>>>
>> <freebsd12-client.pcap.gz><freebsd13-server.pcap.gz>
>
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--
Marek Zarychta
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