Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> schrieb:
> Hello fellow bcache users/developers,
>
> A couple of questions.
>
> 1. How do I disable write caching?
> 2. How do I increase the sequential IO tracking window from 128 IOs to
> say 4096 IOs or nmore?
I don't know which of the various knobs bcache considers but you can tune
the IO window for the kernel IO scheduler with something like this:
#!/bin/sh
for nr_requests in
/sys/bus/scsi/devices/[012]:0:0:0/block/*/queue/nr_requests; do
echo -n 4096 >$nr_requests
done
I suggest switching to deadline also if you haven't done so yet.
Please note that my script tunes my SATA devices. I don't use bcache yet.
You may want to adjust the line to work for the bcache devices.
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