Re: 2.6.2-rc2 Interactivity problems with SMP + HT

[Catalin BOIE]

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).
> >
> > -
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> >
>
> --
> Robert M. Hyatt, Ph.D.          Computer and Information Sciences
> hyatt@xxxxxxx                   University of Alabama at Birmingham
> (205) 934-2213                  136A Campbell Hall
> (205) 934-5473 FAX              Birmingham, AL 35294-1170
>

---
Catalin(ux) BOIE
catab@xxxxxxxxxxxxxxx
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