Package: systemd
Version: 237-2
Severity: normal
Dear Maintainer,
by default Debian uses the pfifo_fast network queuing algorithm:
# tc -s qdisc show
[...]
qdisc pfifo_fast 0: dev eth0 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1
1 1 1 1 1 1
Sent 413728102 bytes 475015 pkt (dropped 0, overlimits 0 requeues 785)
backlog 0b 0p requeues 785
The systemd source package contains this file:
./systemd-237/sysctl.d/50-default.conf:net.core.default_qdisc = fq_codel
whose purpose is to set the default queuing algorithm to fq_codel. According
to the NEWS file, this is a better alternative:
* The default sysctl.d/ snippets will now set:
net.core.default_qdisc = fq_codel
This selects Fair Queuing Controlled Delay as the default
queuing discipline for network interfaces. fq_codel helps
fight the network bufferbloat problem. It is believed to be
a good default with no tuning required for most workloads.
Downstream distributions may override this choice. On 10Gbit
servers that do not do forwarding, "fq" may perform better.
Systems without a good clocksource should use "pfifo_fast".
However the 50-default.conf file is not in the Debian binary package.
Is this intentional or an omission?
Could it be possible to enable fq_codel by default?
-- Package-specific info:
-- System Information:
Debian Release: buster/sid
APT prefers unstable-debug
APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1,
'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 4.14.0-3-rt-amd64 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages systemd depends on:
ii adduser 3.117
ii libacl1 2.2.52-3+b1
ii libapparmor1 2.12-2
ii libaudit1 1:2.8.2-1
ii libblkid1 2.31.1-0.1
ii libc6 2.27-0experimental0
ii libcap2 1:2.25-1.2
ii libcryptsetup12 2:2.0.1-1
ii libgcrypt20 1.8.2-1
ii libgpg-error0 1.27-6
ii libidn11 1.33-2.1
ii libip4tc0 1.6.2-1
ii libkmod2 25-1
ii liblz4-1 0.0~r131-2+b1
ii liblzma5 5.2.2-1.3
ii libmount1 2.31.1-0.1
ii libpam0g 1.1.8-3.7
ii libseccomp2 2.3.1-2.1
ii libselinux1 2.7-2+b1
ii libsystemd0 237-2
ii mount 2.31.1-0.1
ii procps 2:3.3.12-4
ii util-linux 2.31.1-0.1
Versions of packages systemd recommends:
ii dbus 1.13.0-1
ii libpam-systemd 237-2
Versions of packages systemd suggests:
ii policykit-1 0.113-6
pn systemd-container <none>
Versions of packages systemd is related to:
pn dracut <none>
ii initramfs-tools 0.130
ii udev 237-2
--
Laurent.
