From: Thomas Glanzmann Date: Wed, 16 Feb 2022 18:13:45 +0000 (+0100) Subject: more notes X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/m1-debian/commitdiff_plain/54350e1e04d83e9c32647a9ff4a8e730dd7a4b7e?ds=sidebyside more notes --- diff --git a/doc/notes.txt b/doc/notes.txt index 9cebb4f..bd241f4 100644 --- a/doc/notes.txt +++ b/doc/notes.txt @@ -23,3 +23,13 @@ Chromium 16KB patch: https://tg.st/u/Set-kernal-page-size-to-16K-on-loongson-MIP Upstream BUG: https://bugs.webkit.org/show_bug.cgi?id=236564 22:39 < jannau> `dtc -I fs -O dts -o - /proc/device-tree` will output the device-tree as seen by linux + +19:11 < Glanzmann> axboe: Could you explain how to mark a device as write-through? Does that mean if I issue a sync in Linux that no flush will happen. Because this would be helpful for the m1 notebook owners to improve performance. +19:11 < axboe> I just do: `echo "write through" > /sys/block/nvme0n1/queue/write_cache"` for now... +19:11 < axboe> Glanzmann: ^^ +19:12 < axboe> Glanzmann: and yes, that's what it means +19:12 < Glanzmann> axboe: Thanks. +19:12 < axboe> Glanzmann: it'll bump your test case from 56 iops to 14k or something like that :) +19:12 < axboe> alternatively, some sort of time based hack might make sense +19:13 < axboe> "only issue flush if X seconds has passed since last issue" +19:13 < axboe> kinda nasty, but safer