hanging in wait_for_tcp_memory

hanging in wait_for_tcp_memory

[Gerald Krafft]

I have some database processes (Interbase V6) that occasionally seem to 
hang. Using ps or top I found that they are waiting in 
wait_for_tcp_memory. What exactly does wait_for_tcp_memory do and under 
which circumstances does this function block?
I'm using Red Hat Linux 7.2, kernel version 2.4.7-10smp on a dual 
processor machine. Were there any known problems with 
wait_for_tcp_memory in that kernel version that might have been fixed in 
later versions?

Thanks
Gerald

Re: hanging in wait_for_tcp_memory

[Arjan van de Ven]

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On Thu, 2004-03-11 at 13:33, Gerald Krafft wrote:
> I have some database processes (Interbase V6) that occasionally seem to 
> hang. Using ps or top I found that they are waiting in 
> wait_for_tcp_memory. What exactly does wait_for_tcp_memory do and under 
> which circumstances does this function block?
> I'm using Red Hat Linux 7.2, kernel version 2.4.7-10smp on a dual 
> processor machine. Were there any known problems with 
> wait_for_tcp_memory in that kernel version that might have been fixed in 
> later versions

2.4.7-10 had a really really bad vm, so we replaced it with another
kernel the day of 7.2 release (which also was needed for security
fixes). Sounds like you need to apply a bunch of (security) errata to
get your system performing better...

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Re: hanging in wait_for_tcp_memory

[Gerald Krafft]

Thanks, so I will have to upgrade my system to a later kernel. It would 
still be nice if somebody could explain what this kernal function does, 
when it is usually called and under which circumstances it might block.

Gerald

Arjan van de Ven wrote:

> On Thu, 2004-03-11 at 13:33, Gerald Krafft wrote:
> 
>>I have some database processes (Interbase V6) that occasionally seem to 
>>hang. Using ps or top I found that they are waiting in 
>>wait_for_tcp_memory. What exactly does wait_for_tcp_memory do and under 
>>which circumstances does this function block?
>>I'm using Red Hat Linux 7.2, kernel version 2.4.7-10smp on a dual 
>>processor machine. Were there any known problems with 
>>wait_for_tcp_memory in that kernel version that might have been fixed in 
>>later versions
> 
> 
> 2.4.7-10 had a really really bad vm, so we replaced it with another
> kernel the day of 7.2 release (which also was needed for security
> fixes). Sounds like you need to apply a bunch of (security) errata to
> get your system performing better...