[U-Boot] USB storage performance EHCI question

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Aaron Williams

13 Jan 2011 13 Jan '11

4:55 a.m.

I just got EHCI support working with our chip and I was wondering what sort of performance I could expect using ext2? Right now it seems extremely slow coming off of a fast solid-state drive. I'm getting around 100KB/second. It's running at full-speed (480Mbps). Is this normal?

We are basically using the standard EHCI driver with only a few minor modifications.

-Aaron

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Wolfgang Denk

13 Jan 13 Jan

7:09 a.m.

Dear Aaron Williams,

In message 201101121955.04367.Aaron.Williams@caviumnetworks.com you wrote:

...

I just got EHCI support working with our chip and I was wondering what sort of performance I could expect using ext2? Right now it seems extremely slow coming off of a fast solid-state drive. I'm getting around 100KB/second. It's running at full-speed (480Mbps). Is this normal?

As you don't provide any of the important information let me guess: this is on an ARM board, and you are using U-Boot version v2010.09 or older? If this is true then yes, this is to be expected.

Hm... I just notice the "caviumnetworks" in your address, so this is probably MIPS? Check if your caches are turned on...

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de The universe, they said, depended for its operation on the balance of four forces which they identified as charm, persuasion, uncertainty and bloody-mindedness. -- Terry Pratchett, "The Light Fantastic"