Messages in this thread | | | Date | Thu, 8 Jan 2004 02:33:56 -0800 | From | Andrew Morton <> | Subject | Re: Fw: Performance drop 2.6.0-test7 -> 2.6.1-rc2 |
| |
Jan Kasprzak <kas@informatics.muni.cz> wrote: > > Andrew Morton wrote: > : Jan Kasprzak <kas@informatics.muni.cz> wrote: > : > - this is reliable: repeated boot back to 2.6.1-rc2 makes the problem > : > appear again (high load, system slow has hell), booting back > : > to -test7 makes it disappear. > : > : Is the CPU load higher than normal? Excluding I/O wait? > > No, ~30% system is pretty standard for this server. I have looked > just now (2.6.0-test7), and I have 33% system, about 50% nice, > and the rest is user, iowait and idle. Under 2.6.1-rc2 it was about 30% > system and the rest iowait, with small amount of nice and user. > However, the load may be different. It is hard to have any kind of > "fixed" load when you serve data over FTP, HTTP, rsync and do some > other minor tasks (updatedb, current/up2date server, ...).
OK.
> Do you still want the system profiling info?
Nope.
It would be interesting to run some simple benchmarks (dbench, iozone, tiobench, etc) on a relatively idle system.
After that, it'd be a matter of searching through kernel versions, which you presumably cannot do. Or eliminating device mapper from the picture, which is also presumably not an option.
Have you run `hdparm' to check that all those disks have DMA enabled? I guess they have.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |