Hello I'm Alessandro.
I'm evaluating P2020RBD throughput.
I've generated a core and a minimal image through YOCTO SDK 1.7 loading them on ramdisk. I haven't noticed relevant difference, in term of throughput, using core or minimal image.
For my test I've used the default kernel configuration given by Yocto for this board.
Looking at Freescale benchmark of APR 28 2010 the expected result for p2020RDB with a monodirectional traffic of 64 byte was 510000 pkt/sec.
Below you can find U-boot parameters
CPU0: P2020E, Version: 2.1, (0x80ea0021)
Core: E500, Version: 5.1, (0x80211051)
Clock Configuration:
CPU0:1200 MHz, CPU1:1200 MHz,
CCB:600 MHz,
DDR:400 MHz (800 MT/s data rate) (Asynchronous), LBC:75 MHz
L1: D-cache 32 kB enabled
I-cache 32 kB enabled
Board: P2020RDB CPLD: V4.1 PCBA: V4.0
rom_loc: nor upper bank
SD/MMC : 4-bit Mode
eSPI : Enabled
I2C: ready
SPI: ready
DRAM: Detected UDIMM
1 GiB (DDR3, 64-bit, CL=6, ECC off)
Flash: 16 MiB
L2: 512 KB enabled
NAND: 32 MiB
MMC: FSL_SDHC: 0
Bad block table found at page 65504, version 0x01
Bad block table found at page 65472, version 0x01
PCIe1: Root Complex of mini PCIe SLOT, no link, regs @ 0xffe0a000
PCIe1: Bus 00 - 00
PCIe2: Root Complex of PCIe SLOT, x1, regs @ 0xffe09000
02:00.0 - 1095:3132 - Mass storage controller
PCIe2: Bus 01 - 02
In: serial
Out: serial
Err: serial
Net: eTSEC2 is in sgmii mode.
uploading VSC7385 microcode from ef020000
PHY reset timed out
eTSEC1, eTSEC2, eTSEC3
Hit any key to stop autoboot: 0
Doing a test with packet of 64 byte layer2 for a period 120 sec I've instead obtained the results below:
board
| sw
| interrupt coalescing
| buffer descriptor
| throughput [pkt/sec]
|
|---|
| P2020 | CORE | rx-frames=0 tx-frames=0 | bd-rx=256 bx-tx-256 | 296914,06 |
| P2020 | CORE | rx-frames=22 tx-frames=22 | bd-rx=256 bx-tx-256 | 301933,69 |
| P2020 | CORE | rx-frames=22 tx-frames=22 | bd-rx=128 bx-tx-128 | 310937,50 |
I've modified interrupt coalescing and buffer descriptor according the optimized configuration shown in your benchmark.
Despite these modifications the throughput I've obtained is far from 510000 pkt/sec of you benchmark.
What i would like to know is:
- Why my results are so different from yupr benchmark?
- Is there an optimized kernel configuration to use. If yes should you please send me it?
Thanks in advance
Regards
Alessandro
