[squid-users] Rock Store max object size 3.5.14

[Yuri Voinov]

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24.02.16 3:38, Heiler Bemerguy пишет:
>
>
> 23/02/2016 16:40, Yuri Voinov wrote:
>> 
>> When you CPU's/cores waiting for HDD access, they got high-loag.
>>
>
> Are you sure it would show up as "User" load and not as "Wait" ?
Depending OS. Most likely "User" exactly. Still looks like overloaded IO
queue.
> On linux "TOP" it shows something like:
> %Cpu0  :  99,0 *us*,  1,0 sy,  0,0 ni, 0,0 id,  0,0 *wa*,  0,0 hi, 
0,0 si,  0,0 st
top is not performance tool. It hides most important aspects of
performance-related problem. Use it only at a glance tool.

For performance tuning usually uses more specific (and OS-specific, of
course) tools. iostat, vmstat, swap -l, sar etc.
>
>
> 23/02/2016 16:55, Amos Jeffries wrote:
>> What GHz rating is each CPU core?  200-250 RPS is roughly in the range I
>> would expect from a 1.xGHz core going full speed / 100% usage.
>>
>> Are you using RAID on the disk storage? IME, RAID can more than halve
>> the speed of the proxy. Although the CPU thrashing effect is mostly
>> hidden away out of sight in the disk controller processor(s).
>
> 6-core of Intel(R) Xeon(R) CPU E5-2667 v2 @ 3.30GHz
> It's a vmware VM with a NetApp 266TB storage. This VM has access to 2
different LUNs in 2 different controllers to a bunch SAS HDs,
> dd if=/dev/zero of=testfile bs=2G count=1 oflag=dsync = ~391 MB/s
This is tells nothing about SAN topology and whole IO subsystem. There
is much questions occurs here:
- - Which connection uses HDD's bunches? FC? iSCSI? FCoE? If
iSCSI/some_ethernet-Based - did you turned on jumbograms?
- - How much hardware cache installed in controllers and which type?
- - How was created LUN's?
- - Which RAID type you uses and what is it parameters?
- - How configured VMWare? Does you configure deferred syncing VM
caches? Or not?
etc.etc.etc.

Note: NetApp (you have forgotten to specify your NetApp model and
licensed options) has known issues with: CoW with WAFL, hardware
read-cache and write-cache - this is product specific options sold
separately (!) and, generally, tuning NetApp is separated complex task.
Especially with virtualized environment.

And please note: One DD's file - it's about nothing. This is unrelated
to REAL load. As by as abstract IOPS numbers.
>
> Best Regards,
> --
> Heiler Bemerguy - (91) 98151-4894
> Assessor Técnico - CINBESA (91) 3184-1751
>
>
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