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Performance

SFTPGo can easily saturate a Gigabit connection on low end hardware with no special configuration, this is generally enough for most use cases.

For Multi-Gig connections, some performance improvements and comparisons with OpenSSH have been discussed here, most of them have been included in the main branch. To summarize:

  • In current state with all performance improvements applied, SFTP performance is very close to OpenSSH however CPU usage is higher. SCP performance match OpenSSH.
  • The main bottlenecks are the encryption and the messages authentication, so if you can use a fast cipher with implicit messages authentication, such as aes128-gcm@openssh.com, you will get a big performance boost.
  • SCP protocol is much simpler than SFTP and so, the multi-platform, SFTPGo's SCP implementation performs better than SFTP.
  • Load balancing with HAProxy can greatly improve the performance if CPU not become the bottleneck.

Benchmark

Hardware specification

Server
OS Debian 10.2 x64
CPU Ryzen5 3600
RAM 64GB 2400MHz ECC
Disk Ramdisk
Ethernet Mellanox ConnectX-3 40GbE
Client
OS Ubuntu 19.10 x64
CPU Threadripper 1920X
RAM 64GB 2400MHz ECC
Disk Ramdisk
Ethernet Mellanox ConnectX-3 40GbE

Test configurations

  • Baseline: SFTPGo version 0.9.6.
  • Devel: SFTPGo commit b0ed1905918b9dcc22f9a20e89e354313f491734, compiled with Golang 1.14.2. This is basically the same as v1.0.0 as far as performance is concerned.
  • Optimized: Various optimizations applied on top of Devel.
  • Balanced: Two optimized instances, running on localhost, load balanced by HAProxy 2.1.3.
  • OpenSSH: OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019

Server's CPU is in Eco mode, you can expect better results in certain cases with a stronger CPU, especially multi-stream HAProxy balanced load.

Cipher aes128-ctr

The Message Authentication Code (MAC) used is hmac-sha2-256.

SFTP

Download:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 150 243 319 412 452
2 267 452 600 740 735
3 351 637 802 991 1045
4 414 811 1002 1192 1265
8 536 1451 1742 1552 1798

Upload:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 172 273 343 407 426
2 284 469 595 673 738
3 368 644 820 881 1090
4 446 851 1041 1026 1244
8 605 1210 1368 1273 1820
SCP

Download:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 220 369 525 611 558
2 437 659 941 1048 856
3 635 1000 1365 1363 1201
4 787 1272 1664 1610 1415
8 1297 2129 2690 2100 1959

Upload:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 208 312 400 458 508
2 360 516 647 745 926
3 476 678 861 935 1254
4 576 836 1080 1099 1569
8 857 1161 1416 1433 2271

Cipher aes128-gcm@openssh.com

With this cipher the messages authentication is implicit, no SHA256 computation is needed.

SFTP

Download:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 332 423 <-- 583 443
2 533 755 <-- 970 809
3 666 1045 <-- 1249 1098
4 762 1276 <-- 1461 1351
8 886 2064 <-- 1825 1933

Upload:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 348 410 <-- 527 469
2 596 729 <-- 842 930
3 778 974 <-- 1088 1341
4 886 1192 <-- 1232 1494
8 1042 1578 <-- 1433 1893
SCP

Download:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 776 793 <-- 832 578
2 1343 1415 <-- 1435 938
3 1815 1878 <-- 1877 1279
4 2192 2205 <-- 2056 1567
8 3237 3287 <-- 2493 2036

Upload:

Stream Baseline MB/s Devel MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 528 545 <-- 608 584
2 872 849 <-- 975 1019
3 1121 1138 <-- 1217 1412
4 1367 1387 <-- 1368 1755
8 1733 1744 <-- 1664 2510

Optimizations applied

  • AES-CTR optimization of Go compiler for x86_64, there is a patch that hasn't been merged yet, you can apply it yourself.

HAProxy configuration

Here is the relevant HAProxy configuration used for the Balanced test configuration:

frontend sftp
    bind   :2222
    mode   tcp
    timeout  client  600s
    default_backend sftpgo

backend sftpgo
    mode    tcp
    balance roundrobin
    timeout connect 10s
    timeout server  600s
    timeout queue   30s
    option  tcp-check
    tcp-check expect string SSH-2.0-

    server sftpgo1 127.0.0.1:2022 check send-proxy-v2 weight 10 inter 10s rise 2 fall 3
    server sftpgo2 127.0.0.1:2024 check send-proxy-v2 weight 10 inter 10s rise 2 fall 3