your both el5 and el6 Apache status show lots of R -- Reading
On Mon, Apr 8, 2013 at 10:24 AM, Banyan He <banyan@xxxxxxxxxxx> wrote:
> I did a quick test on el5 and el6 with these package,
>
> httpd-2.2.3-43.el5.centos
> httpd-2.2.15-15.el6.centos.1.i686
>
> I kept the configuration as what it is in default. The index page is about
> 7k, 100 connections per second. I barely find the connection is marked as
> R. Mostly C and _. This is done by ab from httpd.
>
> I also did a quick test with slow attack. It's basically slowing the
> client itself to collect the data from the server. I did 200 connections
> per second. My server is ok seems. A little bit slow, but not too much.
>
> el5
>
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> RRRRRRRRCWS.....................................................
>
> el6
>
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
> RRRCRRRRCCCCCCCRWCCCCCWCCCCCCWWCCCCCCCCCCCCCCCCCCCCCCCCCCC......
>
>
> I also did the capture on the network traffic that I can find out the
> connections are doing something bad. You may follow the lead here as I
> mentioned.
>
>
>
> ------------
> Banyan He
> Blog: http://www.rootong.com
> Email: banyan@xxxxxxxxxxx
>
> On 4/7/2013 12:23 AM, linuxsupport wrote:
>
> There is no problem with the hardware, If I installed CentOS 5 then it
> works well, at a time out of total 44 concurrent requests 34 were in
> reading state
>
>
> On Sat, Apr 6, 2013 at 2:03 PM, Banyan He <banyan@xxxxxxxxxxx> wrote:
>
>> I went to the source code to check this. Seems like it's used for
>> against the slow request attack from the rate. There is a timeout and rate
>> set for header and body.
>>
>> I'd keep that thought, capture one connection from tcpdump seeing if they
>> are doing something bad. If not, you seem need a new server balancing the
>> traffic.
>>
>> ------------
>> Banyan He
>> Blog: http://www.rootong.com
>> Email: banyan@xxxxxxxxxxx
>>
>> On 4/6/2013 3:06 PM, linuxsupport wrote:
>>
>> I have already checked but all requests are from different IP's and
>> even different subnet
>> When there are less requests it works ok even if there are more than 60%
>> reading requests but during peak time when concurrent requests goes beyond
>> 150, due to reading requests it becomes 300+ requests processing at the
>> same time and that then Apache stop responding as maxclient is set to 300.
>> CPU load also goes up and thing become very slow.
>>
>>
>> On Sat, Apr 6, 2013 at 10:33 AM, Banyan He <banyan@xxxxxxxxxxx> wrote:
>>
>>> I'd recommend you to sort out the connections. Find out if they are
>>> coming from the same client or the same subnet of the clients. Doing a
>>> simple tcpdump capture to analyze the data seeing if it's a good R or a bad
>>> R.
>>>
>>> Don't really think it's because of the version.
>>>
>>> ------------
>>> Banyan He
>>> Blog: http://www.rootong.com
>>> Email: banyan@xxxxxxxxxxx
>>>
>>>
>>> On 4/6/2013 12:24 PM, linuxsupport wrote:
>>>
>>>> I am facing a problem with Apache on CentOS 6
>>>>
>>>> Apache 2.2.19 is complied from source.
>>>>
>>>> I see so many reading requests in Apache status page, as per my previous
>>>> experience this "reading request" issue mainly comes when any of the
>>>> internet route having any problem and it request takes time to
>>>> completely
>>>> reach to Apache, but this time there is no network issue.
>>>>
>>>> I have ran same setup on CentOS 5 it works well, but on CentOS 6 it show
>>>> 60%+ reading requests, web site has 20-25 requests per second that
>>>> becomes
>>>> 80+
>>>>
>>>> I also tried to upgrade Apache to 2.2.24 but it is same on new version
>>>> as
>>>> well.
>>>>
>>>> Anyone else has experienced this issue?
>>>> _______________________________________________
>>>> CentOS mailing list
>>>> CentOS@xxxxxxxxxx
>>>> http://lists.centos.org/mailman/listinfo/centos
>>>>
>>>>
>>>
>>
>>
>
>
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