From: Shreyansh Jain <shreyansh.jain@nxp.com>
To: Jianfeng Tan <jianfeng.tan@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Cc: "thomas@monjalon.net" <thomas@monjalon.net>,
Olivier Matz <olivier.matz@6wind.com>,
Anatoly Burakov <anatoly.burakov@intel.com>
Subject: Re: [dpdk-dev] [PATCH] eal: fix threads block on barrier
Date: Fri, 27 Apr 2018 17:36:56 +0000 [thread overview]
Message-ID: <HE1PR0402MB2780B91365742CFF549F7F8F908D0@HE1PR0402MB2780.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <1524847302-88110-1-git-send-email-jianfeng.tan@intel.com>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jianfeng Tan
> Sent: Friday, April 27, 2018 10:12 PM
> To: dev@dpdk.org
> Cc: thomas@monjalon.net; Jianfeng Tan <jianfeng.tan@intel.com>; Olivier
> Matz <olivier.matz@6wind.com>; Anatoly Burakov
> <anatoly.burakov@intel.com>
> Subject: [dpdk-dev] [PATCH] eal: fix threads block on barrier
>
> Below commit introduced pthread barrier for synchronization.
> But two IPC threads block on the barrier, and never wake up.
>
> (gdb) bt
> #0 futex_wait (private=0, expected=0, futex_word=0x7fffffffcff4)
> at ../sysdeps/unix/sysv/linux/futex-internal.h:61
> #1 futex_wait_simple (private=0, expected=0,
> futex_word=0x7fffffffcff4)
> at ../sysdeps/nptl/futex-internal.h:135
> #2 __pthread_barrier_wait (barrier=0x7fffffffcff0) at
> pthread_barrier_wait.c:184
> #3 rte_thread_init (arg=0x7fffffffcfe0)
> at ../dpdk/lib/librte_eal/common/eal_common_thread.c:160
> #4 start_thread (arg=0x7ffff6ecf700) at pthread_create.c:333
> #5 clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
> Through analysis, we find the barrier defined on the stack could be the
> root cause. This patch will change to use heap memory as the barrier.
>
> Fixes: d651ee4919cd ("eal: set affinity for control threads")
>
> Cc: Olivier Matz <olivier.matz@6wind.com>
> Cc: Anatoly Burakov <anatoly.burakov@intel.com>
>
> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Though I have seen Stephen's comment on this (possibly a library bug), this at least fixes an issue which was dogging dpaa and dpaa2 - generating bus errors and futex errors with variation in core masks provided to applications.
Thanks a lot for this.
Acked-by: Shreyansh Jain <shreyansh.jain@nxp.com>
next prev parent reply other threads:[~2018-04-27 17:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-27 16:41 Jianfeng Tan
2018-04-27 16:42 ` Thomas Monjalon
2018-04-27 17:03 ` Stephen Hemminger
2018-04-27 17:36 ` Shreyansh Jain [this message]
2018-04-27 17:39 ` Stephen Hemminger
2018-04-27 17:45 ` Shreyansh Jain
2018-04-27 19:52 ` Thomas Monjalon
2018-04-28 1:21 ` Stephen Hemminger
2018-04-28 4:15 ` Tan, Jianfeng
2018-04-28 1:24 ` Stephen Hemminger
2018-04-28 4:22 ` Tan, Jianfeng
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