There seems to be an issue w/ ssh performance.

JohnMarkGurney worked a bit w/ pkelsey on debugging an issue w/ SSH performance over high latency links. This was started by the thread ssh over WAN: TCP window too small.

Most of the testing was done on FreeBSD HEAD, using r282774 (host) and r284880 (vm). Testing was done w/ a bhyve vm, running dummynet on the vm, and the tap interface on the host bridged w/ the ethernet interface. Without any delay in the link, it can achieve a speed of ~20MB/sec.

Hint: To get TCP buffer information, run netstat -xnfinet.

/etc/ipfw.conf:

pipe 1 config delay 50
add 100 pipe 1 ip from any to any
add 65000 allow ip from any to any

Testing w/ nc showed that with a delayed link, the window will grow and get to around 17MB/sec.

In the case of: ssh jmg@192.168.0.21 cat /dev/zero > /dev/null

The buffer will grow to ~160k and a max of 1.6MB/sec.

In the case of: ssh jmg@192.168.0.21 dd of=/dev/null bs=1m < /dev/zero

The buffer will grow to ~80k and a max of 512KB/sec.

Testing w/ OpenSSH 7.1p1 (as both client and server) does no better.

The sysctl kern.ipc.maxsockbuf defaults to 2MB. This needs to be increased if you want you're HIWA to grow larger than 2MB, when you adjust net.inet.tcp.sendbuf_max and/or net.inet.tcp.recvbuf_max.


Benchmarks by AllanJude

Setup:

Traffic generation:

20GB via loopback

Base: OpenSSH_6.6.1p1, OpenSSL 1.0.2d-freebsd 9 Jul 2015

Cipher

mac

Performance

aes128-ctr

umac-64-etm

5,620 mbps

aes128-gcm

implicit

5,170 mbps

aes256-ctr

umac-64-etm

5,000 mbps

aes256-gcm

implicit

5,050 mbps

chacha20-poly1305

implicit

1,250 mbps

none

umac-64-etm

6,240 mbps

Ministat of results

Ports: OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015

Cipher

mac

Performance

aes128-ctr

umac-64-etm

3,500 mbps

aes128-gcm

implicit

4,670 mbps

aes256-ctr

umac-64-etm

3,220 mbps

aes256-gcm

implicit

4,450 mbps

chacha20-poly1305

implicit

1,240 mbps

none

umac-64-etm

3,530 mbps

Ministat of results

20GB via 10gbps network

Base: OpenSSH_6.6.1p1, OpenSSL 1.0.2d-freebsd 9 Jul 2015

Cipher

mac

Performance

aes128-ctr

umac-64-etm

5,235 mbps

aes128-gcm

implicit

5,160 mbps

aes256-ctr

umac-64-etm

4,960 mbps

aes256-gcm

implicit

4,850 mbps

chacha20-poly1305

implicit

1,260 mbps

none

umac-64-etm

6,275 mbps

Ministat of results

Ports: OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015

Cipher

mac

Performance

aes128-ctr

umac-64-etm

3,120 mbps

aes128-gcm

implicit

4,460 mbps

aes256-ctr

umac-64-etm

3,050 mbps

aes256-gcm

implicit

4,165 mbps

chacha20-poly1305

implicit

1,240 mbps

none

umac-64-etm

3,570 mbps

Ministat of results


New Benchmarks by AllanJude

Setup:

60 GiB of data (approximately 1 minute at 8 gbps):

 # dd if=/dev/zero bs=128k count=480k | /usr/bin/ssh test@host dd of=/dev/null bs=128k

Benchmarking base OpenSSL (1.0.2j) w/ and w/o AES-NI

The ia32cap variable disables specific instructions:

Benchmarks with AES-NI enabled and disabled in the bios:

Disable Both AES-NI and PCLMULQDQ

 # OPENSSL_ia32cap="~0x200000200000000" openssl speed -elapsed -evp aes-128-cbc
 AES-NI ON:  363 MB/s
 AES-NI OFF: 363 MB/s
 # OPENSSL_ia32cap="~0x200000200000000" openssl speed -elapsed -evp aes-128-gcm
 AES-NI ON:  260 MB/s
 AES-NI OFF: 260 MB/s

Disable only AES-NI

 # OPENSSL_ia32cap="~0x200000000000000" openssl speed -elapsed -evp aes-128-cbc
 AES-NI ON:  363 MB/s
 AES-NI OFF: 363 MB/s
 # OPENSSL_ia32cap="~0x200000000000000" openssl speed -elapsed -evp aes-128-gcm
 AES-NI ON:  516 MB/s
 AES-NI OFF: 516 MB/s

Normal

 # openssl speed -elapsed -evp aes-128-cbc
 AES-NI ON:  768 MB/s
 AES-NI OFF: 363 MB/s
 # openssl speed -elapsed -evp aes-128-gcm
 AES-NI ON:  3315 MB/s
 AES-NI OFF: 516 MB/s

mercat5/7:

base ssh + base ssl (OpenSSH_7.2p2, OpenSSL 1.0.2j-freebsd 26 Sep 2016):

localhost

nc

11,100 mbps

localhost

aes128-gcm

8,500 mbps

localhost

aes128-gcm

3,100 mbps

AES-NI disabled in BIOS

localhost

aes256-gcm

7,800 mbps

aes128-gcm

NIC

base->base

base->ports NOHPN

base->ports HPN

ports NOHPN->base

ports NOHPN->ports NOHPN

ports NOHPN->ports HPN

ports HPN->base

ports HPN->ports HPN

ports HPN->ports NOHPN

localhost

8,330 mbps

8,350 mbps

7,660 mbps

8,350 mbps

8,300 mbps

x

8,160 mbps

7,610 mbps

x

cxgbe->bxe

8,650 mbps

8,860 mbps

5,370 mbps

8,560 mbps

8,700 mbps

5,370 mbps

8,560 mbps

5,340 mbps

8,680 mbps

bxe->cxgbe

5,870 mbps

5,720 mbps

3,170 mbps

5,965 mbps

5,900 mbps

3,170 mbps

5,900 mbps

3,170 mbps

5,800 mbps

ports ssh (NO HPN) + base ssl (OpenSSH_7.3p1, OpenSSL 1.0.2j-freebsd 26 Sep 2016):

localhost

aes128-gcm

8,500 mbps

localhost

aes128-gcm

3,100 mbps

AES-NI disabled in BIOS

localhost

aes256-gcm

7,800 mbps

cxgbe->bxe

aes128-gcm

8,000 mbps

bxe->cxgbe

aes128-gcm

,00 mbps

seems to be the NIC

ports ssh (HPN) + base ssl (OpenSSH_7.3p1, OpenSSL 1.0.2j-freebsd 26 Sep 2016):

localhost

aes128-gcm

7,400 mbps

HPN seems to hurt localhost

localhost

aes128-gcm

3,100 mbps

AES-NI disabled in BIOS

localhost

aes256-gcm

7,000 mbps

cxgbe->bxe HPN->HPN

aes128-gcm

5,400 mbps

???

cxgbe->bxe HPN->bNO

aes128-gcm

8,600 mbps

HPN improves sending

cxgbe->bxe HPN->pNO

aes128-gcm

9,000 mbps

HPN improves sending to not HPN..?

ports ssh (HPN) + ports ssl (OpenSSH_7.3p1, OpenSSL 1.0.2j 26 Sep 2016):

localhost

aes128-gcm

8,600 mbps

localhost

aes256-gcm

7,950 mbps

SSHPerf (last edited 2016-12-13 02:46:39 by AllanJude)