Messages in this thread | | | Date | Thu, 1 Dec 2005 22:21:05 +0100 | From | Ingo Molnar <> | Subject | Re: Perf degradation from -rt14 onwards |
| |
* Dinakar Guniguntala <dino@in.ibm.com> wrote:
> I was wondering why the following change was made from -rt14 > onwards. > > > @@ -1634,7 +1531,7 @@ asmlinkage long sys_futex(u32 __user *ua > int val3) > { > struct timespec t; > - unsigned long timeout = MAX_SCHEDULE_TIMEOUT; > + unsigned long timeout = 0; > > This was introduced in patch-2.6.14-rt13-rf3 by David. > > This seems to return spurious -ETIMEDOUT errors even in the non-robust > code and results in userspace (glibc) retrying several mutex > operations before it succeeds. I was chasing down a degradation of > performance of some testcases and was able to fix those by reverting > this change back.
nice catch! I've undone this change in my tree.
Ingo - 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/
| |