答复: High CPU load when write use samba 4.3.11
Zhangxiaoxu
zhang.xiaoxu at h3c.com
Wed Mar 22 03:49:45 UTC 2017
Hi,
Are you configuring samba shares on cluster and writing something on shares.
Provide provide complete background of Issue. Use-case. Setup detials.
Yes, the samba working with a cluster.
We just write 25 files the same time use one smb connection.
And one of the server occurs the issue.
Where same smbd can write fast & where slow?
The high cpu load server write slowly, the traffic wasn’t smooth, with server jitter.
Is there some difference in 2 machine configurations?
The server configuration is the same.
Set log level =10, the ctdb print ‘CTDB_REQ_MESSAGE queue full - killing client connection.’
We note that, the samba use more RES sometimes than other normal node.
And the RES don’t freed when the write operation complete.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1597197 nobody 20 0 404932 18000 15536 R 42.4 0.0 2:43.78 smbd
2546523 nobody 20 0 2774704 2.262g 17188 S 75.8 2.4 27:52.04 smbd
With pmap command:
000055b52f115000 2352108K rw--- [ anon ]
Br
Zhang Xiaoxu.
发件人: amit kumar [mailto:amitkuma at redhat.com]
发送时间: 2017年3月21日 20:52
收件人: zhangxiaoxu 13123 (RD)
抄送: samba-technical at lists.samba.org
主题: Re: High CPU load when write use samba 4.3.11
Hello,
Are you configuring samba shares on cluster and writing something on shares.
Provide provide complete background of Issue. Use-case. Setup detials.
Where same smbd can write fast & where slow?
Is there some difference in 2 machine configurations?
Thanks
Amit Kumar
On 03/21/2017 05:54 PM, Zhangxiaoxu via samba-technical wrote:
Hi samba-team,
High CPU load when write use samba 4.3.11.
Top command:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
464708 nobody 20 0 2543720 2.041g 22028 R 91.2 2.2 73:56.20 smbd
In another server, it cost about 40% when write the same files.
A lot of logs was printed during write:
[2017/03/21 19:57:53.532109, 1] ../librpc/ndr/ndr.c:578(ndr_pull_error)
ndr_pull_error(11): Pull bytes 8 (../librpc/ndr/ndr_basic.c:234)
[2017/03/21 19:57:53.532161, 1] ../source3/locking/share_mode_lock.c:312(parse_share_modes)
ndr_pull_share_mode_lock failed: Buffer Size Error
Configuration:
usershare allow guests = yes
clustering = yes
max protocol = SMB3
large readwrite = yes
aio write behind = true
load printers = no
Could you give us some help about the issue.
Thanks.
Br
Zhang Xiaoxu.
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Thanks
Amit Kumar
There are three ways to get something done:
(1) Do it yourself.
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(3) Forbid your kids to do it.
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