Re: 2.6.2-rc2 Interactivity problems with SMP + HT

On Friday 30 January 2004 02:25, 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.
>
I'm having similar problems with kmail on the later kernels. Sometimes 
it works just fine, and in the middle of typing a nessage it can get 
laggy as hell, cursor motions with the arrow keys are down to 1 space 
a second, and gkrellm is saying the user apps are at 100% cpu.  
Screen redraws for a page up or page down might take 3 or 4 seconds.
Or it can get over it. (sometimes)

>> 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
>> [email protected]                   University of Alabama at
>> Birmingham (205) 934-2213                  136A Campbell Hall
>> (205) 934-5473 FAX              Birmingham, AL 35294-1170
>
>---
>Catalin(ux) BOIE
>[email protected]
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