Re: [BUG] Raid1/5 over iSCSI trouble

["BERTRAND Joël" <joel.bertrand@systella.fr>]

Dan Williams wrote:
> On 10/24/07, BERTRAND Joël <joel.bertrand@systella.fr> wrote:
>>         Hello,
>>
>>         Any news about this trouble ? Any idea ? I'm trying to fix it, but I
>> don't see any specific interaction between raid5 and istd. Does anyone
>> try to reproduce this bug on another arch than sparc64 ? I only use
>> sparc32 and 64 servers and I cannot test on other archs. Of course, I
>> have a laptop, but I cannot create a raid5 array on its internal HD to
>> test this configuration ;-)
>>
> 
> Can you collect some oprofile data, as Ming suggested, so we can maybe
> see what md_d0_raid5 and istd1 are fighting about?  Hopefully it is as
> painless to run on sparc as it is on IA:
> 
> opcontrol --start --vmlinux=/path/to/vmlinux
> <wait>
> opcontrol --stop
> opreport --image-path=/lib/modules/`uname -r` -l

	Done.

Profiling through timer interrupt
samples  %        image name               app name 
symbol name
20028038 92.9510  vmlinux-2.6.23           vmlinux-2.6.23           cpu_idle
1198566   5.5626  vmlinux-2.6.23           vmlinux-2.6.23           schedule
41558     0.1929  vmlinux-2.6.23           vmlinux-2.6.23           yield
34791     0.1615  vmlinux-2.6.23           vmlinux-2.6.23           NGmemcpy
18417     0.0855  vmlinux-2.6.23           vmlinux-2.6.23 
xor_niagara_5
17430     0.0809  raid456                  raid456                  (no 
symbols)
15837     0.0735  vmlinux-2.6.23           vmlinux-2.6.23 
sys_sched_yield
14860     0.0690  iscsi_trgt.ko            iscsi_trgt               istd
12705     0.0590  nf_conntrack             nf_conntrack             (no 
symbols)
9236      0.0429  libc-2.6.1.so            libc-2.6.1.so            (no 
symbols)
9034      0.0419  vmlinux-2.6.23           vmlinux-2.6.23 
xor_niagara_2
6534      0.0303  oprofiled                oprofiled                (no 
symbols)
6149      0.0285  vmlinux-2.6.23           vmlinux-2.6.23 
scsi_request_fn
5947      0.0276  ip_tables                ip_tables                (no 
symbols)
4510      0.0209  vmlinux-2.6.23           vmlinux-2.6.23 
dma_4v_map_single
3823      0.0177  vmlinux-2.6.23           vmlinux-2.6.23 
__make_request
3326      0.0154  vmlinux-2.6.23           vmlinux-2.6.23           tg3_poll
3162      0.0147  iscsi_trgt.ko            iscsi_trgt 
scsi_cmnd_exec
3091      0.0143  vmlinux-2.6.23           vmlinux-2.6.23 
scsi_dispatch_cmd
2849      0.0132  vmlinux-2.6.23           vmlinux-2.6.23 
tcp_v4_rcv
2811      0.0130  vmlinux-2.6.23           vmlinux-2.6.23 
nf_iterate
2729      0.0127  vmlinux-2.6.23           vmlinux-2.6.23 
_spin_lock_bh
2551      0.0118  vmlinux-2.6.23           vmlinux-2.6.23           kfree
2467      0.0114  vmlinux-2.6.23           vmlinux-2.6.23 
kmem_cache_free
2314      0.0107  vmlinux-2.6.23           vmlinux-2.6.23 
atomic_add
2065      0.0096  vmlinux-2.6.23           vmlinux-2.6.23 
NGbzero_loop
1826      0.0085  vmlinux-2.6.23           vmlinux-2.6.23           ip_rcv
1823      0.0085  nf_conntrack_ipv4        nf_conntrack_ipv4        (no 
symbols)
1822      0.0085  vmlinux-2.6.23           vmlinux-2.6.23 
clear_bit
1767      0.0082  python2.4                python2.4                (no 
symbols)
1734      0.0080  vmlinux-2.6.23           vmlinux-2.6.23 
atomic_sub_ret
1694      0.0079  vmlinux-2.6.23           vmlinux-2.6.23 
tcp_rcv_established
1673      0.0078  vmlinux-2.6.23           vmlinux-2.6.23 
tcp_recvmsg
1670      0.0078  vmlinux-2.6.23           vmlinux-2.6.23 
netif_receive_skb
1668      0.0077  vmlinux-2.6.23           vmlinux-2.6.23           set_bit
1545      0.0072  vmlinux-2.6.23           vmlinux-2.6.23 
__kmalloc_track_caller
1526      0.0071  iptable_nat              iptable_nat              (no 
symbols)
1526      0.0071  vmlinux-2.6.23           vmlinux-2.6.23 
kmem_cache_alloc
1373      0.0064  vmlinux-2.6.23           vmlinux-2.6.23 
generic_unplug_device
...

	Is it enough ?

	Regards,

	JKB

-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/