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<div> <font face="Arial, Helvetica, sans-serif">Hello <br>
Thanks for the reply.I am using lustre-1.8.1.1 .I am working on a new module which is used for some kind of delegation operations.I am using Lnet operations in this module.<br>
<br>
<br>
The code which fails is <br>
do {<br>
rc = LNetEQWait(lnet_eq_hd, &ev);<br>
if( ev.type == LNET_EVENT_PUT )<br>
break;<br>
<br>
} while ( rc != 0);<br>
<br>
<br>
<br>
<br>
Here i am waiting on some PUT event from a client and then break from the loop.And do some operations accordingly.But next time when i perform some PUT operation (for example) and it gets logged into the event queue i try reading from that event but the MDS fails.<br>
I also tried using these functions</font><font color="black" face="arial" size="2"><font face="Arial, Helvetica,
sans-serif"><font face="Arial, Helvetica, sans-serif"> </font>//rc = LNetEQPoll( &lnet_eq_hd, 1,2000, &ev,
&which); in place of LNetEQWait but it says undefined .<br>
<br>
Can you please throw some light on </font></font><font><font color="black" face="arial" size="2">eq_callback function as i havnt found it in Lnet manual to go through.</font></font><br>
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sans-serif">
</font></font><br>
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The log before crashing shows :<br>
<br>
<br>
Mar 4 20:35:08 ws11 kernel: type=LNET_EVENT_SEND, pt-idx=53, mbits=0x1234abcd, rlen=64, mlen=64, md.user_ptr=0xaaaabbbb, hdr-data=0x0<br>
Mar 4 20:35:08 ws11 kernel: status=0, unlnk=0, offset=0, seq=2 <br>
<br>
//Iam asssuming it fails here as till here it prints fine.I also want to mention that this operation is successful as well. <br>
<br>
<br>
Mar 4 20:35:27 ws11 kernel: BUG: soft lockup - CPU#0 stuck for 10s! [insmod:4609]<br>
Mar 4 20:35:27 ws11 kernel: CPU 0:<br>
Mar 4 20:35:27 ws11 kernel: Modules linked in: tmod(U) ksocklnd(U) ko2iblnd(FU) lnet(U) libcfs(U) autofs4(U) hidp(U) nfs(U) fscache(U) nfs_acl(U) rfcomm(U) l2cap(U) bluetooth(U) lockd(U) sunrpc(U) cpufreq_ondemand(U) acpi_cpufreq(U) freq_table(U) ip_conntrack_netbios_ns(U) ipt_REJECT(U) xt_state(U) ip_conntrack(U) nfnetlink(U) iptable_filter(U) ip_tables(U) ip6t_REJECT(U) xt_tcpudp(U) ip6table_filter(U) ip6_tables(U) x_tables(U) rdma_ucm(U) ib_sdp(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U) ipoib_helper(U) ib_cm(U) ib_sa(U) ipv6(U) xfrm_nalgo(U) crypto_api(U) ib_uverbs(U) ib_umad(U) mlx4_en(U) mlx4_ib(U) mlx4_core(U) loop(U) dm_multipath(U) scsi_dh(U) video(U) hwmon(U) backlight(U) sbs(U) i2c_ec(U) button(U) battery(U) asus_acpi(U) acpi_memhotplug(U) ac(U) lp(U) snd_hda_intel(U) snd_seq_dummy(U) snd_seq_oss(U) snd_seq_midi_event(U) snd_seq(U) snd_seq_device(U) snd_pcm_oss(U) snd_mixer_oss(U) ib_mthca(U) snd_pcm(U) snd_timer(U) snd_page_alloc(U) ib_mad(U) snd_hwdep(U) snd(U) sg(U) ib_core(U) e100(U) ide_cd(<br>
Mar 4 20:35:27 ws11 kernel: ) mii(U) serio_raw(U) pcspkr(U) i2c_i801(U) cdrom(U) soundcore(U) parport_pc(U) shpchp(U) i2c_core(U) parport(U) dm_raid45(U) dm_message(U) dm_region_hash(U) dm_mem_cache(U) dm_snapshot(U) dm_zero(U) dm_mirror(U) dm_log(U) dm_mod(U) ata_piix(U) libata(U) sd_mod(U) scsi_mod(U) ext3(U) jbd(U) uhci_hcd(U) ohci_hcd(U) ehci_hcd(U)<br>
Mar 4 20:35:27 ws11 kernel: Pid: 4609, comm: insmod Tainted: GF 2.6.18-128.7.1.el5-lustre.1.8.1.1smp-cust #2<br>
Mar 4 20:35:27 ws11 kernel: RIP: 0010:[<ffffffff80064c54>] [<ffffffff80064c54>] .text.lock.spinlock+0x2/0x30<br>
Mar 4 20:35:27 ws11 kernel: RSP: 0018:ffff810021099d10 EFLAGS: 00000286<br>
Mar 4 20:35:27 ws11 kernel: RAX: 0000000000000002 RBX: 00000000ffffffff RCX: ffff810021099df8<br>
Mar 4 20:35:27 ws11 kernel: RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffffff8888a7a0<br>
Mar 4 20:35:27 ws11 kernel: RBP: ffff81003a04e1c0 R08: ffff810021099ddc R09: 000000001234abcd<br>
.......<br>
<br>
<br>
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</font>
</div>
<div> I hope this helps <br>
<br>
Thanks <br>
<br>
<br>
<br>
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<div> <br>
</div>
<div> <br>
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<div style="font-family: arial,helvetica; font-size: 10pt; color: black;">-----Original Message-----<br>
From: Liang Zhen <liang@whamcloud.com><br>
To: Ravi <raviprakashdrbh@aol.com><br>
Cc: lustre-devel <lustre-devel@lists.lustre.org><br>
Sent: Fri, Mar 4, 2011 8:54 pm<br>
Subject: Re: [Lustre-devel] LNetPoll undefined<br>
<br>
<div id="AOLMsgPart_1_929e19d7-e9fc-4d5c-9fa9-02f38da71216">
Hi Ravi,
<div><br>
</div>
<div>Which version of Lustre/LNet are you trying with? Are you trying to build some new code over LNet? Could you show us some example code if you don't mind?</div>
<div>btw, If you are trying this in kernel space, I would suggest to use eq_callback (LNetEQAlloc(...eq_callback)) instead of LNetEQPoll/LNetEQWait, which is better for performance. Polling is not good for performance because all EQs share one single waitq in LNet. </div>
<div><br>
</div>
<div>Regards</div>
<div>Liang</div>
<div><br>
<div>
<div>On Mar 5, 2011, at 9:30 AM, Ravi wrote:</div>
<br class="Apple-interchange-newline"><blockquote type="cite"><font color="black" face="arial" size="2"><font size="2"><font face="Arial, Helvetica, sans-serif">Hello <br>
<br>
I am using LNetWait (blocking call ) on a particular event .After i recevie this event i break from the loop which waits for this event and proceed but when another event is added into the event queue the system crashes.I thought LNetPoll would be better as i can just poll for that particular event without disturbing the event queue but when i make i get undefined.Any thoughts .<br>
</font></font><font color="black" face="arial" size="2">
<div> <br>
</div>
<div> Thanks <br>
Ravi <br>
<br>
</div>
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