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* Qualcomm decided to increase the read-ahead value to 512KiB [1]. * This value resulted in frequent cases where read-ahead would be waiting for new I/O requests and thus ending up being synchronous rather than asynchronous. * As result, the main goal of Qualcomm's patch [1] which is to increase throughput ends up in a regression where read throughput is significantly lower than it ever would be with the recommended [2] read-ahead value. * This patch uses our existing loop in ramdisk to set the read-ahead value to 128KiB. [1] https://source.codeaurora.org/quic/la/kernel/msm-4.19/commit/include/linux/mm.h?h=LA.UM.9.12.r1-09000-SMxx50.0&id=25d04e4ceb7c067907901842c223d62973d73a75 [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/include/linux/mm.h?h=v4.19.160#n2397 Change-Id: I1980d904568fe4f1ce7b676452bcc44e4689f02f Co-authored-by: clarencelol <clarencekuiek@icloud.com> |
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