| To: | William Cohen <wcohen@xxxxxxxxxx> |
|---|---|
| Subject: | Re: PCP Network Latency PMDA |
| From: | fche@xxxxxxxxxx (Frank Ch. Eigler) |
| Date: | Thu, 19 Jun 2014 16:59:30 -0400 |
| Cc: | pcp@xxxxxxxxxxx |
| Delivered-to: | pcp@xxxxxxxxxxx |
| In-reply-to: | <53A34A47.3060008@xxxxxxxxxx> (William Cohen's message of "Thu, 19 Jun 2014 16:38:31 -0400") |
| References: | <53A34A47.3060008@xxxxxxxxxx> |
| User-agent: | Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux) |
William Cohen <wcohen@xxxxxxxxxx> writes: > I have been looking at a PMDA that provides information about how long > it takes for packets to make their way from userspace to the network > device and from network device to userspace. [...] Neat. > network.interface.in.latency instance "devname" > network.interface.out.latency instance "devname" > [...] > (latency_sum[t]-latency_sum[t-delta])/(packets[t]-packets[t-delta]) This sounds like just the sort of thing that we'd use dsmith's richer pcp-systemtap interface widgetry, currently being designed, and this computation could be one of its examples. Keep the ideas coming, and work with dsmith. (I would not suggest building just this into a separate PMDA.) - FChE |
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