Am 21.08.2019 um 23:39 schrieb Toke Høiland-Jørgensen:
Sebastian Gottschall <[email protected]> writes:
Am 21.08.2019 um 18:21 schrieb Sebastian Moeller:
On August 21, 2019 6:12:03 PM GMT+02:00, Sebastian Gottschall
<[email protected]> wrote:
thats rather old. i rewrote all the qos code in the last 4 or 5 days.
so
things might be changed. next phase is bringing all the link level
detail configuration stuff into the gui which will be done
tomorrow or at least still within this week.
i also added now cake to some smaller low budged routers with limited
resources, so see how it runs. i had bad experiences with fq_codel in
the past due some high memory usage.
especially since its hard coded somewhat into the wireless ath9k
driver.
so i already modded it for more efficient handling. 4 mb max per queue
is simply too much for a 32 mb ram based router.
This is why I'm sqm we reduced the queued packet maximum m to around 1000, and
also why cake has an explicit memlimit keyword.
yeah but does this help if fq_codel is hardcoded into mac80211? fq_codel
has a memlimit keyword too btw. its fixed to 4MB. i reduced it to 256kb
on low memory architectures. no other way to get around OOM problems
mac80211 does always make use of fq_codel. it has a own build in
implementation
The mac80211 implementation also has a memlimit parameter. You can set
it through debugfs - 2MB would be:
echo 2097152 > /sys/kernel/debug/ieee80211/phy0/aqm
or through iw:
iw phy phy0 set txq memory_limit 2097152
The nl80211 attribute is called NL80211_ATTR_TXQ_MEMORY_LIMIT.
as i said i already modified mac80211 in a way that it sets sane memory
limits depending on the architecture. devices with just 32 mb ram run
only stable with 256kb memory limit.
so i configured different defaults. but the point is still that for a
standard user (lets say in openwrt) the current implementation is not
good. somewhere in the openwrt community i was reading that such devices
should not be used anymore for openwrt due the memory limitations. but
thats no solution for me if it was working before the introduction of
fq_codel in mac80211
-Toke
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