RT Sigio broken on 2.4.19-pre8

RT Sigio broken on 2.4.19-pre8

[Aaron Sethman]

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Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
SIGIO.  Note that 2.4.18 works fine.

Regards,

Aaron
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Re: RT Sigio broken on 2.4.19-pre8

[Aaron Sethman]

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Actually looking at it closer... It seems rtsig-nr keeping rising slowly
as the system runs.

Regards,

Aaron

On Sat, 25 May 2002, Aaron Sethman wrote:

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>
>
> Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> SIGIO.  Note that 2.4.18 works fine.
>
> Regards,
>
> Aaron
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> -
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Re: RT Sigio broken on 2.4.19-pre8

[Peter Wächtler]

Aaron Sethman wrote:
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> 
> 
> Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> SIGIO.  Note that 2.4.18 works fine.
> 

What is this Poller_bench and where do I get it?

Re: RT Sigio broken on 2.4.19-pre8

[Austin Gonyou]

Ahh...yes..I see a few apps exhibiting bad behaviour because of RT Sigio
not working. :(

Anyone know if it's fixed in -aa3?(i'm using -aa2)

RedCarpet seems to be a primary exhibitor on my desktop box.

On Mon, 2002-05-27 at 03:25, Peter Wächtler wrote:
> Aaron Sethman wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > 
> > Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> > working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> > SIGIO.  Note that 2.4.18 works fine.
> > 
> 
> What is this Poller_bench and where do I get it?
> 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

Re: RT Sigio broken on 2.4.19-pre8

[Aaron Sethman]

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http://www.kegel.com/dkftpbench/

Its part of dkftpbench.

Regards,

Aaron

On Mon, 27 May 2002, Peter Wächtler wrote:

> Aaron Sethman wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> >
> > Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> > working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> > SIGIO.  Note that 2.4.18 works fine.
> >
>
> What is this Poller_bench and where do I get it?
>
>
>
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Re: RT Sigio broken on 2.4.19-pre8

[Dan Kegel]

Aaron Sethman wrote:
> > > Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> > > working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> > > SIGIO.  Note that 2.4.18 works fine.
> > > ... It seems rtsig-nr keeping rising slowly as the system runs.

That sounds like the way I'm clearing the signal queue is not working.
Here's a minimal test case for clearing the signal queue.  Could
you try it and tell me what it says?
- Dan

#include <stdio.h>
#include <signal.h>
#include <assert.h>

int main(int argc, char **argv)
{
        sigset_t sigset;
        siginfo_t info;
        static struct timespec timeout = {0,0};

        // block delivery of SIGRTMIN
        sigemptyset(&sigset);
        sigaddset(&sigset, SIGRTMIN);
        assert(0 == sigprocmask(SIG_BLOCK, &sigset, NULL));

        // clear signal queue
        assert(0 == signal(SIGRTMIN, SIG_IGN)); // POSIX says this clears the queue

        // Make sure that cleared the queue.  (Note that timeout is zero here.)
        assert(sigtimedwait(&sigset, &info, &timeout) != SIGRTMIN);

        printf("test passed\n");
        exit(0);
}

Re: RT Sigio broken on 2.4.19-pre8

[Dan Kegel]

Dan Kegel wrote:
> 
> Aaron Sethman wrote:
> > > > Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> > > > working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> > > > SIGIO.  Note that 2.4.18 works fine.
> > > > ... It seems rtsig-nr keeping rising slowly as the system runs.
> 
> That sounds like the way I'm clearing the signal queue is not working.
> Here's a minimal test case for clearing the signal queue.  Could
> you try it and tell me what it says?

Er, forgot to send the signal.  Corrected test case:

#include <stdio.h>
#include <signal.h>
#include <assert.h>

int main(int argc, char **argv)
{
    sigset_t sigset;
    siginfo_t info;
    static struct timespec timeout = {0,0};

    // block delivery of SIGRTMIN
    sigemptyset(&sigset);
    sigaddset(&sigset, SIGRTMIN);
    assert(0 == sigprocmask(SIG_BLOCK, &sigset, NULL));

    raise(SIGRTMIN);

    // clear signal queue
    assert(0 == signal(SIGRTMIN, SIG_IGN)); // POSIX says this clears the queue

    // Make sure that cleared the queue.  (Note that timeout is zero here.)
    assert(sigtimedwait(&sigset, &info, &timeout) != SIGRTMIN);

    printf("test passed\n");
    exit(0);
}

Re: RT Sigio broken on 2.4.19-pre8

[Aaron Sethman]

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On Mon, 27 May 2002, Dan Kegel wrote:
>
> That sounds like the way I'm clearing the signal queue is not working.
> Here's a minimal test case for clearing the signal queue.  Could
> you try it and tell me what it says?
> - Dan

The test passed.  What it looks like is, the kernel for some reason is not
decrementing the queued count for some reason.  I have a server doing RT
sigio and after a while, the rtsig-nr count goes up to 1024 and never
comes back down even if I kill that process.

Regards,

Aaron
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Re: RT Sigio broken on 2.4.19-pre8

[Aaron Sethman]

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On Mon, 27 May 2002, Dan Kegel wrote:
>
> Er, forgot to send the signal.  Corrected test case:

Just tried the corrected version, still passed.

Regards,

Aaron

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Re: RT Sigio broken on 2.4.19-pre8

[Dan Kegel]

Aaron Sethman wrote:
> > > > > > Using the Dan Kegel's Poller_bench utility I noticed that RT SIGIO is not
> > > > > > working on 2.4.19-pre8.  Basically sigtimedwait() is always returning
> > > > > > SIGIO.  Note that 2.4.18 works fine.
> > > > > > ... It seems rtsig-nr keeping rising slowly as the system runs.
> > >
> > > That sounds like the way I'm clearing the signal queue is not working.
> > > Here's a minimal test case for clearing the signal queue.  Could
> > > you try it and tell me what it says?
>
> Just tried the corrected version, still passed.

I can't reproduce the problem here.  

What version of dkftpbench are you using?  What parameters?
Can you send me your kernel .config file?

I did notice and fix an embarassing problem in Poller_bench of 
dkftpbench-0.42; it aborted when Poller_sigio sent its initial readiness
notification (it's spurious, but programs are supposed to
be able to handle that).  Fix is at 
http://www.kegel.com/dkftpbench/pb.patch

Thanks,
Dan