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performance.md

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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, some of them need upstream updates so there are not included in the SFTPGo released version (0.9.6) yet. 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 [email protected], 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 3* Intel P4510 4TB RAID0
Ethernet Mellanox ConnectX-3 40GbE
Client
OS Ubuntu 19.10 x64
CPU Threadripper 1920X
RAM 64GB 2400MHz ECC
Disk Samsung 960EVO 1TB
Ethernet Mellanox ConnectX-3 40GbE

Test configurations

  • Baseline: SFTPGo version 0.9.6.
  • Optimized: Various optimizations applied on top of 0.9.6.
  • 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 Optimized MB/s Balanced MB/s OpenSSH MB/s
1 149 306 370 378
2 265 576 675 720
3 341 807 880 1002
4 402 1024 1150 1222
8 518 1749 1400 1815

Upload:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 165 292 340 355
2 262 453 490 633
3 327 566 560 726
4 376 647 650 788
8 478 735 700 806
SCP

Download:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 215 509 579 470
2 433 928 1097 828
3 613 1327 1346 1174
4 824 1670 1576 1424
8 1281 2656 2049 1870

Upload:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 189 354 393 428
2 312 510 570 668
3 401 621 664 803
4 481 705 723 840
8 652 767 799 884

Cipher [email protected]

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

SFTP

Download:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 322 388 561 401
2 518 734 976 810
3 638 1067 1214 1072
4 723 1283 1415 1288
8 844 2072 1742 1842

Upload:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 318 353 415 381
2 473 542 573 670
3 569 672 657 757
4 621 730 721 758
8 694 825 763 815
SCP

Download:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 669 734 818 447
2 1218 1320 1367 883
3 1752 1738 1755 1217
4 2202 2238 2038 1475
8 3151 3184 2391 1941

Upload:

Stream Baseline MB/s Optimized MB/s Balanced MB/s OpenSSH MB/s
1 446 446 494 448
2 616 623 646 650
3 746 749 728 741
4 833 832 788 858
8 897 903 823 887

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.

  • Use minio/sha256-simd to accelerate MAC (Message Authentication Code) computation. In this way the tested hardware will use Intel SHA Extensions for SHA256 computation. This will give a significant performance boost compared to AVX2 extensions used with the Go's SHA256 implementation. This patch is now included in SFTPGo master branch.

    diff --git a/go.mod b/go.mod
index f1b2caa..109e064 100644
--- a/go.mod
+++ b/go.mod
@@ -43,3 +43,5 @@ require (
)

replace github.com/eikenb/pipeat v0.0.0-20190316224601-fb1f3a9aa29f => github.com/drakkan/pipeat v0.0.0-20200123131427-11c048cfc0ec
+
+replace golang.org/x/crypto => github.com/drakkan/crypto v0.0.0-20200303175438-17ef3d252b1c

  • A new allocator for pkg/sftp which greatly improve parallel loads. We are discussing about this patch with pkg/sftp maintainers here.

    diff --git a/go.mod b/go.mod
index 109e064..4d67a47 100644
--- a/go.mod
+++ b/go.mod
@@ -45,3 +45,4 @@ require (
replace github.com/eikenb/pipeat v0.0.0-20190316224601-fb1f3a9aa29f => github.com/drakkan/pipeat v0.0.0-20200123131427-11c048cfc0ec

replace golang.org/x/crypto => github.com/drakkan/crypto v0.0.0-20200303175438-17ef3d252b1c
+replace github.com/pkg/sftp => github.com/drakkan/sftp v0.0.0-20200319122022-2fc68482d27f

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