Shoud it be provided as an option to use bfq scheduler? Rrouters do not
involve many I/O operations so I guess mq-deadline is enough.
Reference:
https://github.com/NoTengoBattery/openwrt-mt7621/commit/a2385cd792542da38c90a0718e9a7952f848ecba
The CFQ IO scheduler is deleted from the Linux kernel
since commit f382fb0bcef4c37dc049e9f6963e3baf204d815c
"block: remove legacy IO schedulers".
The new multiqueue block layer has an IO scheduler named
BFQ (Budget Fair Queue) that is suitable for slow
single-queue block devices such as (S)ATA harddrives,
flash memories, MMC/SD cards and USB dongles, so activate
that instead.
To actually use BFQ by default distributions such as
Fedora uses this (/lib/udev/rules.d/60-block-scheduler.rules):
ACTION=="add", SUBSYSTEM=="block", \
KERNEL=="mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|sd*[!0-9]|sr*", \
ATTR{queue/scheduler}="bfq"
We are not using udev so we need a similar rule in a
similar patch for procd, or we can patch the kernel to
use BFQ by default if we do not expect people to use
OpenWRT with enterprise storage arrays.
Signed-off-by: Linus Walleij <[email protected]>
---
This patch is more of an RFC, I am in contact with the
author of BFQ if we need to discuss its applicability for
OpenWRT targets. I can make a kernel patch to make BFQ
the default IO scheduler as well.
---
target/linux/generic/config-5.10 | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/target/linux/generic/config-5.10 b/target/linux/generic/config-5.10
index 120d1d8c3f4a..fda3ef301dde 100644
--- a/target/linux/generic/config-5.10
+++ b/target/linux/generic/config-5.10
@@ -2601,8 +2601,7 @@ CONFIG_INPUT_MISC=y
# CONFIG_INV_MPU6050_SPI is not set
# CONFIG_IOMMU_SUPPORT is not set
# CONFIG_IONIC is not set
-# CONFIG_IOSCHED_BFQ is not set
-# CONFIG_IOSCHED_CFQ is not set
+CONFIG_IOSCHED_BFQ=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_NOOP=y
CONFIG_IO_STRICT_DEVMEM=y
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