Messages in this thread | | | Date | Tue, 13 Jan 2004 16:06:37 -0800 | From | Andrew Morton <> | Subject | Re: Busy-wait delay in qmail 1.03 after upgrading to Linux 2.6 |
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Haakon Riiser <hakonrk@ulrik.uio.no> wrote: > > > Output from time: > > > > real 0m0.309s > > user 0m0.011s > > sys 0m0.004s > > Just wanted to comment on my own data, since I just noticed it myself: > > The output from time indicates that the system is _not_ using CPU > while delaying, so you might wonder why I said it did. The reason > is that I'm using an AfterStep applet (ascpu) to monitor CPU usage, > and it appeared to work fine in 2.6. Now, I see that there are > differences: For example, another problem I encountered while > upgrading to 2.6 was that disk intensive jobs, such as updating > the slocate database, made ascpu report 100% CPU usage. I just > ran top (procps 2.0.16) beside it, and it reported approximately > 10% CPU usage, which is no more than 2.4 used.
2.6 has finer-grained cpu utilisation accounting; probably ascpu is accidentally lumping I/O wait into system time.
Still, some of those delays seem excessive and if you indeed are seeing longer runtimes than with 2.4, something is up.
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