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charset="us-ascii" Content-Transfer-Encoding: quoted-printable TCS Confidential Hi Stephen, Thank you for your reply. Please find my answers inline. 1.Do you have threads fighting over timer? No , we are running the thread on only one core so there is no deadlock her= e. But as discussed earlier the thread is getting stuck in an infinite whil= e loop with prev[lvl]->sl_next[lvl] =3D -459511634 in timer_get_prev_enter= ies(). 2.What context is rte_timer_reset() being called in? During Uplink and Downlink data transfer, we are using the thread of fronth= aul library, where it executes callbacks for every 1 ms, and for every call= back we are trying to reset the timer. 3.The commit id"[cid:2e8dda97-6a2a-474d-ba0a-98e7789a4014]" which you have = shared, we are unable to find it in the git. If possible, can you please sh= are the link of the same? -- Thanks and Regards Jayasvi Battu / Nagma TCS Confidential -----Original Message----- From: Stephen Hemminger Sent: Monday, November 6, 2023 9:57 PM To: Nagma Meraj Cc: dev@dpdk.org; Jayasvi Battu ; RAJESH GUTTULA ; Nidhi Tomar Subject: Re: rte_timer_reset related issues in DPDK 20.05 External Email : Be cautious while opening any links or attachments. On Mon, 6 Nov 2023 10:31:20 +0000 Nagma Meraj > wrote: > TCS Confidential > > Hi, > > We are working on Front Haul Library which is using DPDK internally for d= ata accleration. > In that we are facing the following issues: > 1.In Front Haul Library, one of the threads xran_timing_source_thread() i= s using DPDK rte_timer_reset() where in the timer_add() it is printing nega= tive values in the timer_get_prev_enteries(). Do you have threads fighting over timer? What context is rte_timer_reset() being called in? > 2. That is,in prev[lvl]->sl_next[lvl] =3D -459511634 is taking negative = value in a while loop as in the below code snippet and is going in an infin= ite loop because of which the above thread is getting stuck here and it is = failing. Can we get possible scenarios when this type of errors generally o= ccurs? > > [cid:2e8dda97-6a2a-474d-ba0a-98e7789a4014] > > > Thanks & Regards, > Nagma Meraj > > > TCS Confidential > =3D=3D=3D=3D=3D-----=3D=3D=3D=3D=3D-----=3D=3D=3D=3D=3D > Notice: The information contained in this e-mail message and/or > attachments to it may contain confidential or privileged information. > If you are not the intended recipient, any dissemination, use, review, > distribution, printing or copying of the information contained in this > e-mail message and/or attachments to it are strictly prohibited. If > you have received this communication in error, please notify us by > reply e-mail or telephone and immediately and permanently delete the > message and any attachments. Thank you Please don't put this on mailing list mail. If lawyers are watching, in theory we should ignore your mail. --_000_BM1PR01MB2228AD0382DF5F14C495B2FCF6A9ABM1PR01MB2228INDP_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

TCS Confidential


Hi Stephen,

Thank you for your reply.

Please find my answers inline.

1.Do you have threads fighting over timer?

No , we are running the thread on only one cor= e so there is no deadlock here. But as discussed earlier the thread is gett= ing stuck in an infinite while loop with prev[lvl]->sl_next[lvl]  = =3D -459511634 in timer_get_prev_enteries().

 

 

2.What context is rte_timer_reset() being called = in?

 

During Uplink and Downlink data transfer, we a= re using the thread of fronthaul library, where it executes callbacks for e= very 1 ms, and for every call back we are trying to reset the timer.

 

 

3.The commit id"[cid:2e8dda97-6a2a-474d-ba0a= -98e7789a4014]" which you have shared, we are unable to find it in = the git. If possible, can you please share the link of the same?=

 

--

Thanks and Regards

Jayasvi Battu / Nagma

 


TCS Confidential

-----Original Message-----
From: Stephen Hemminger <stephen@networkplumber.org>
Sent: Monday, November 6, 2023 9:57 PM
To: Nagma Meraj <nagma.meraj@tcs.com>
Cc: dev@dpdk.org; Jayasvi Battu <jayasvi.battu@tcs.com>; RAJESH GUTTU= LA <rajesh.guttula@tcs.com>; Nidhi Tomar <nidhi.tomar1@tcs.com>=
Subject: Re: rte_timer_reset related issues in DPDK 20.05

 

External Email : Be cautious while opening any li= nks or attachments.

 

On Mon, 6 Nov 2023 10:31:20 +0000

Nagma Meraj <nagma.meraj@tcs= .com> wrote:

 

> TCS Confidential

>

> Hi,

>

> We are working on Front Haul Library which i= s using DPDK internally for data accleration.

> In that we are facing the following issues:<= o:p>

> 1.In Front Haul Library, one of the threads = xran_timing_source_thread() is using DPDK rte_timer_reset() where in the ti= mer_add() it is printing negative values in the timer_get_prev_enteries().<= o:p>

 

Do you have threads fighting over timer?

What context is rte_timer_reset() being called in= ?

 

 

> 2. That is,in  prev[lvl]->sl_next[lv= l] =3D -459511634 is taking negative value in a while loop as in the below = code snippet and is going in an infinite loop because of which the above th= read is getting stuck here and it is failing. Can we get possible scenarios when this type of errors generally occurs?<= /o:p>

>

> [cid:2e8dda97-6a2a-474d-ba0a-98e7789a4014]

>

>

> Thanks & Regards,

> Nagma Meraj

>

>

> TCS Confidential

> =3D=3D=3D=3D=3D-----=3D=3D=3D=3D=3D-----=3D= =3D=3D=3D=3D

> Notice: The information contained in this e-= mail message and/or

> attachments to it may contain confidential o= r privileged information.

> If you are not the intended recipient, any d= issemination, use, review,

> distribution, printing or copying of the inf= ormation contained in this

> e-mail message and/or attachments to it are = strictly prohibited. If

> you have received this communication in erro= r, please notify us by

> reply e-mail or telephone and immediately an= d permanently delete the

> message and any attachments. Thank you<= /o:p>

 

Please don't put this on mailing list mail.<= /o:p>

If lawyers are watching, in theory we should igno= re your mail.

 

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