答复: High CPU load when write use samba 4.3.11

[Zhangxiaoxu]

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

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  (1) Do it yourself.

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