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A20 SATA write speed improvement



I tested the recently added sunxi-dev patch to improve the SATA write speed. Here are the results:


Board: Cubietruck
OS: Ubuntu Bionic (18.04.2), Armbian 5.86
Kernel: 5.1.0 with and without RFC-drivers-ata-ahci_sunxi-Increased-SATA-AHCI-DMA-TX-RX-FIFOs.patch

SATA-device: SAMSUNG SSD 830 Series, 256GB


Measurement method: dd if=/dev/zero of=/tesfile bs=? count=? oflag=direct

bs: measured 4k, 64k and 1M block sizes
count: adjusted to ensure that data written is ~500MB


Measurements below are made with kernel 5.1.0 without (before) and with the mentioned patch:

dd bs  Before MB/s  After MB/s  Increase
4k            13.3        19.0       43%
64k           35.9        82.0      128%
1M            42.5       112.0      164%

As you can see, the SATA write speed improved, especially when using larger block sizes. Up to now, no negative side-effects encountered.


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16 hours ago, pi-rat said:

same kernel versio


15 hours ago, Igor said:

do this manual procedure

in the past some installation broke during the Update. To improve stability some parts have been decoupled.

Since then u rarely read about update problems :)


// sent from mobile phone //

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