[Bug 1067] New: linux pmda does too much work for network.interface queries

[bugzilla-daemon@xxxxxxxxxxx]

Bug ID	1067
Summary	linux pmda does too much work for network.interface queries
Product	pcp
Version	unspecified
Hardware	All
OS	Linux
Status	NEW
Severity	major
Priority	P5
Component	pcp
Assignee	pcp@kenj.com.au
Reporter	fche@redhat.com
CC	pcp@oss.sgi.com
Classification	Unclassified

Created attachment 322 [details]
strace output

An strace of pmcd, for a query of only "pminfo -f network.interface.in.bytes"
indicates it's doing too much work.

% sudo strace  -T -tt -f -p $(pgrep pmcd) &

% pminfo -f network.interface.in.bytes

network.interface.in.bytes
    inst [0 or "lo"] value 29794011946
    inst [2 or "p2p1"] value 4606099151404

% kill [strace]

The strace log indicates multiple opens of /proc/net/dev, and a slew of
ioctl's and other /sys/class/net/FOO/... reads, all just to answer data
that's available in a single read from /proc/net/dev.  That extra work
should be avoided.

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