i summon one kim

By default many Linux network interface card drivers set their SMP affinity mask to either all zeroes or all ones (“ff” — the length of the mask depends on the number of CPUs on the system). The former results in all queues and interfaces running on CPU ID 0, which can become a performance bottleneck due to insufficient computing power. The latter results in all queues and interfaces being scheduled on multiple CPUs, which can become a performance bottleneck due to increased CPU memory cache misses. (more…)

Since switching to the iCloud Photo Library, the Photos app on my laptop has kept telling me that

• 1 Item on This Mac Only
• Unable to Upload 9 Items

To identify the oddball photos, I created the following smart folders respectively:

• [Photo] [is] [referenced]
• [Photo] [is] [unable to upload to iCloud Photo Library]

Referenced photos can be consolidated into the library and would then be uploaded to iCloud — mine was a duplicate, so I just deleted it. The photos that could not be uploaded were photos that had been deleted, but somehow a reference had been kept or imported.

References:

• Items on This Mac Only
• Photos for Mac says “Unable to upload 222 items”

If you have already upgraded to jessie and have systemd as init, you can switch back with these commands:

apt-get install -y sysvinit-core
reboot
apt-get purge -y systemd

Running with sysvinit works better on my servers, as daemons have a chance of doing their own graceful shutdown before the network is brought down.

Before upgrading to jessie, create /etc/apt/preferences.d/use-sysvinit:

Package: systemd-sysv
Pin: release o=Debian
Pin-Priority: -1

See also: How to stay with sysvinit in Debian Jessie by Petter Reinholdtsen

Windows Update has been getting stuck checking for new updates for the past several months. The automatic update somehow manages to complete, at least sometimes, but running a check manually doesn’t complete within a couple of days. It should be more like minutes, shouldn’t it? (more…)