RE： GSPI and SDIO performance for 8686

[claud_yu]

hi Harvey, 

The iMX31 and OMAP3530 MMC host driver don't claim the host or driver  have capacity to handle SDIO irq. And SDIO stack use polling mechanism to deal with sdio irq. And pool performance (~1Mb/s) is reasonable. The Ricon (sdhci) or PXA mmc driver have the SDIO_IRQ capacity , and the performance will be up to ~20Mb. 

I evaluate GSPI mode the iMX31 SPI interface , and get reasonable performance to me (9~10Mb) at 15Mhz SPI clock.


Claud Yu

--- 09/7/30 (四)，Tim Harvey <tharvey at irobot.com> 寫道：

> 寄件者: Tim Harvey <tharvey at irobot.com>
> 主旨: GSPI and SDIO performance for 8686
> 收件者: libertas-dev at lists.infradead.org
> 日期: 2009年7月30日,四,上午12:59
> Greetings,
> 
> I've seen a lot of activity lately and development of the
> GSPI interface for libertas.  What max throughput have
> people been able to get with an 8686 talking over GSPI?
> 
> My previous evaluation with an 8686 talking over SDIO (both
> to an i.MX31 SDHC on a patched 2.6.22 and to an OMAP3x SDHC
> on 2.6.28 beagleboard) showed a horribly slow max throughput
> of about 1.4mbps.  Has anyone seen better performance
> in recent libertas/kernel with the OMAP3x SDHC (ie talking
> to the 8686 on an Overo Fire/Air)?
> 
> Thanks,
> 
> Tim
> 
> _______________________________________________
> libertas-dev mailing list
> libertas-dev at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/libertas-dev
> 


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