Is the I/O bus to the SD card on RPi2 easily saturated?

Raspberry Pi 2

Is the I/O bus to the SD card on RPi2 easily saturated?

Postby graysky » Fri Jun 19, 2015 8:13 am

While preforming a `pacman -Syu` on my RPi2, I find that the operation pauses after packages start getting unpacked if there is a number of packages to install. It seems as though the SD card I/O has been saturated by the unpacking operation (my hardware is a class 10 card). I haven't experienced this on the B+ model. Do others experience this?

If I'm correct that the cause is saturation of the I/O, it because the processors in the RPi2 is just faster at serving up the data to page out to disk and now, the disk writes are the bottleneck whereas on the B+ model, it was CPU limited? Thanks for your comments and insights.
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Re: Is the I/O bus to the SD card on RPi2 easily saturated?

Postby WarheadsSE » Fri Jun 19, 2015 1:48 pm

SD is still going to be slow. Period. You just might not have noticed it because the Pi 1's v6h processor was crapola.
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Re: Is the I/O bus to the SD card on RPi2 easily saturated?

Postby graysky » Fri Jun 19, 2015 2:17 pm

Thanks for the confirmation that it is I/O bound :)
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