Messages in this thread | | | From | Bill Davidsen <> | Subject | Re: 2.6.2-rc2 Interactivity problems with SMP + HT | Date | Sun, 01 Feb 2004 16:00:31 -0500 |
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Catalin BOIE wrote: > On Thu, 29 Jan 2004, Robert M. Hyatt wrote: > > >> >>It might be some IDE disk I/O that results from flushing buffers or >>whatever. I don't see this on my SCSI boxes, but I have seen an IDE >>box get sluggish at times due to I/O. > > > It is possible. > vmstat shows a lot of writes when this happen. > Seems that even reads hangs. > I remember tat I was in pine and I tried to save a small file (under 1k) > and it took 5-7 seconds to do it. > > >>On Thu, 29 Jan 2004, Nick Piggin >>wrote: >> >> >>> >>>Catalin BOIE wrote: >>> >>> >>>>Hello! >>>> >>>>First, thank you very much for the effort you put for Linux! >>>> >>>>I have a Intel motherboard with SATA (2 Maxtor disks). >>>>CPUs: 2 x 2.4GHz PIV HT = 4 processors (2 virtual) >>>>1 GB RAM. >>>> >>>>Load: postgresql and apache. Very low load (3-4 clients). >>>> >>>>RAID: Yes, soft RAID1 between the 2 disks. >>>> >>>>I have times when the console freeze for 3-4 seconds! >>>>2.6.0-test11 had the same problem (maybe longer times). >>>>2.6.1-rc2 worked good in this respect but crashed after 2 days. :( >>>>2.6.2-rc2 is back with the delay. >>>> >>>>Do you know why this can happen? >>>> >>>> >>> >>>There haven't been many scheduler changes there recently so >>>maybe its something else. >>> >>>But you could try the latest -mm kernels. They have some >>>Hyperthreading work in them (you need to enable CONFIG_SCHED_SMT).
Another possible improvement might come from the recent ide changes posted here for evaluation. There was a change to not block all devices or even all devices on a cable if one device delayed. I believe it was if a command didn't finish as intended, but I don't have it handy since I sent it off for testing tomorrow on a system which may have that problem.
There's a good bit of work on hangs happening right now, so you could wait or dig up the patches and try them. I think they were by Davin McCall if memory serves.
-- bill davidsen <davidsen@tmr.com> CTO TMR Associates, Inc Doing interesting things with small computers since 1979 - 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/
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