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https://github.com/AsahiLinux/u-boot
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5a834c1f9e
We noticed on the DXR2 platform (AM335x with a SMSC LAN9303 switch connected to the CPSW MAC) that the network performance in U-Boot is quite poor. Only when the transfer is started without a cable connected, and the cable is plugged after the first timeout "T" occured, an increased in performance can be seen. Debugging has revealed, that the cpsw driver has constant link checking builtin into the rx and tx functions. This results in the bad performance and seems to be unnecessary. The link has already been checked in the init function, before the transfer is started. This usually is sufficient. BTW: I have seen no other network driver in U-Boot so far, that constantly checks for link in the rx / tx functions. The performance numbers on the DXR2 board are: 0.56 MiB/s cpsw_check_link() in rx and tx path 0.87 MiB/s cpsw_check_link() only in tx path 1.0 MiB/s cpsw_check_link() only in rx path 2.7 MiB/s no cpsw_check_link() in rx and tx path So with this patch the network performance on DXR2 increases from 0.56 to 2.7 MiB/s (nearly 5 times as fast). Signed-off-by: Stefan Roese <sr@denx.de> Tested-by: Samuel Egli <samuel.egli@siemens.com> Tested-by: Heiko Schocher <hs@denx.de> Cc: Vladimir Koutny <vladimir.koutny@streamunlimited.com> Cc: Mugunthan V N <mugunthanvnm@ti.com> Cc: Joe Hershberger <joe.hershberger@gmail.com> Cc: Tom Rini <trini@ti.com> |
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| bios_emulator | ||
| block | ||
| bootcount | ||
| core | ||
| crypto | ||
| ddr/fsl | ||
| demo | ||
| dfu | ||
| dma | ||
| fpga | ||
| gpio | ||
| hwmon | ||
| i2c | ||
| input | ||
| memory | ||
| misc | ||
| mmc | ||
| mtd | ||
| net | ||
| pci | ||
| pcmcia | ||
| power | ||
| qe | ||
| rtc | ||
| serial | ||
| sound | ||
| spi | ||
| tpm | ||
| twserial | ||
| usb | ||
| video | ||
| watchdog | ||
| Makefile | ||