Re: [Linux-ATM-General] "atmtcp virtual" freezes the whole system when run on SMP kernel

[chas w. - C. <ch...@cm...>]

well i did have some luck just converting the spinlock to a semaphore.
its not the right solution but it does work.

In message <41B...@ik...>,Tuomo Tikkanen writes:
>chas williams - CONTRACTOR wrote:
>> actually after thinking about it, i suspect your problem is related 
>> the general sleeping while holding the atm 'global' spin lock problem.
>> quite a bit of the atm stack has been changed to deal with this.
>> 
>
>Yesterday I tested (with my colleague, thanks to him too ;-) ) various 
>kernel versions. Our finding was that kernel version 2.4.21 has this 
>"freeze" problem still, but 2.4.22 does not. When we went quickly 
>through the patch from *.21 to *.22 we noticed that there were numerous 
>spinlock related changes in ATM related files.
>
>Our problem is that we have to use a bit modified RH9 company internal 
>distribution in our work including the kernel from that distribution. So 
>it is not basically possible that we just change the kernel version 
>because that would require "too complicated installation issues" to the 
>end users. However it would be possible to get our internal distribution 
>manager to apply necessary patches to company RH distribution to get it 
>work with atmtcp on SMP machines too.
>
>So our next step, I guess, is to just apply ATM related patches between 
>2.4.20 and 2.4.22 to our current 2.4.20 based RH kernel. If there is 
>anyone who can give pinpoint hints what changes would be the absolute 
>minimal ones to get atmtcp to work on SMP machine we would appreciate 
>that very much.
>
>-- 
>Tuo...@ik...
>
>
>
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