Googling around copy_user_generic_unrolled() - a kernel space function -
seen in my previous smbd profiling, I found what might be a clue for the
performance drop. It is a comment on line #31 (see below) that says:
31 /*
32 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
33 * Otherw
That is funny. Now that I replaced samba 4 and libc-2.13.so with debug
symbols, the perf profile seems to be have changed a bit after the same
tests !
Events: 54K cycles
- 3.06% smbd [kernel.kallsyms] [k] copy_user_generic_unrolled
- copy_user_generic_unrolled
52.63% __read_
Agreed. For some strange reason I though perf would "follow" the new smbd
forked and account their data too =)
Unfortunately, I don't have the libc symbols (at least for today) to see
what is going on there, but here is what I got in the child smbd process on
the server side. The client side is a
On Mon, Sep 30, 2013 at 05:21:44PM -0300, Thiago Fernandes Crepaldi wrote:
> Andrew, in my company we are also experiencing a higher CPU usage of Samba
> 4 (smbd) if compared to Samba 3.
>
> In fact, it almost reaches 100% of CPU and uses all the memory during *dir
> copies* (individual file copy
Andrew, in my company we are also experiencing a higher CPU usage of Samba
4 (smbd) if compared to Samba 3.
In fact, it almost reaches 100% of CPU and uses all the memory during *dir
copies* (individual file copy is as good as samba 3's). I strongly believe
that this CPU usage is the responsible f
On Mon, 2013-08-26 at 22:39 +0530, Prema wrote:
> Dear Andrew,
>
> As per your suggestion , I have attached the gdb log of the samba and smbd
> process log running in the single server mode.
> Also when I noted in the perf top, libndr.so consumes the maximum cpu.
> I noticed that it happens soon a
Dear Andrew,
As per your suggestion , I have attached the gdb log of the samba and smbd
process log running in the single server mode.
Also when I noted in the perf top, libndr.so consumes the maximum cpu.
I noticed that it happens soon after sometime the samba process is started
and the CPU is fi
On Mon, 2013-08-26 at 22:39 +0530, Prema wrote:
>
>
> Dear Andrew,
>
>
> As per your suggestion , I have attached the gdb log of the samba and
> smbd process log running in the single server mode.
>
> Also when I noted in the perf top, libndr.so consumes the maximum cpu.
> I noticed that it h
