https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282115
Bug ID: 282115
Summary: GELI + QAT - 8955 performance is less than software
encoding for block device acceleration
Product: Base System
Version: 14.1-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 254268
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=254268&action=edit
Memory Disk QAT + Geli Test Steps
Having installed an Intel QAT 8955 card and tested performance, there is a
significant decrease in speed with the QAT card enabled compared to software
crypto.
The CPU used for these offline tests was an old Intel(R) Xeon(R) CPU E5-2403 0
@ 1.80GHz that has the AES-NI instruction set. Fresh install of FreeBSD 14.1-p5
was used for each test, that than a custom kernel with AES-NI removed.
The disk used to test against in the results below is a WD BLACK SN750 SE in a
PCI slot adapter. The DD speed to a mounted volume for this disk is 1532 MB/s.
The script to generate these results is attached for referencem but uses a
memory disk for testing maximal throughput.
The /boot/loader.conf is:
dev.qat.0.cfg_services = "sym;asym"
qat_dh895xcc_fw_load="YES"
qat_load="YES"
cryptodev_load="YES"
Parameters: A:HMAC/SHA256 E:AES-CBC L:256
Crypto: hardware
irq85: qat0:b0 77310798 1368
irq86: qat0:b1 120404887 2130
DD - DISK_BLK_SIZE:4096 DD_BLK_SIZE:8388608 DD_COUNT:25
** write speed: (66,475,964 bytes/sec)
irq85: qat0:b0 77310798 1368
irq86: qat0:b1 120833699 2137
Parameters: A:HMAC/SHA256 E:AES-XTS L:256 BS:4096
Crypto: hardware
irq85: qat0:b0 77310798 1367
irq86: qat0:b1 121389848 2147
DD - DISK_BLK_SIZE:4096 DD_BLK_SIZE:8388608 DD_COUNT:25
** Write speed: (61,894,122 bytes/sec)
irq85: qat0:b0 77310798 1367
irq86: qat0:b1 121841632 2155
Parameters: A:HMAC/SHA256 E:AES-CBC L:256 BS:4096
Crypto: software
DD - DISK_BLK_SIZE:4096 DD_BLK_SIZE:8388608 DD_COUNT:25
** write speed: (110,486,470 bytes/sec)
Parameters: A:HMAC/SHA256 E:AES-XTS L:256
Crypto: software
DD - DISK_BLK_SIZE:4096 DD_BLK_SIZE:8388608 DD_COUNT:25
** write speed: (102,362,135 bytes/sec)
The above shows a drop in performance of 40%.
Additionally when using the attached memory disk example, the throughput of
this system tops out at ~135Mbps when writing to a mounted encrypted ramdisk
UFS volume, with the 4 cores operating at about 25% each.
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