Re: 2.6.2-rc2 Interactivity problems with SMP + HT
Catalin BOIE <[email protected]>
| Newsgroups | org.kernel.vger.linux-smp,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
> >>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. Thank you very much. > > > -- > bill davidsen <[email protected]> > CTO TMR Associates, Inc > Doing interesting things with small computers since 1979 > --- Catalin(ux) BOIE [email protected]