Re: Something hitting my total number of connections to the server

On Wed, Aug 23, 2017 at 1:08 AM, Akshat Kakkar wrote: > > On Tue, Aug 22, 2017 at 5:58 PM, Neal Cardwell wrote: > > On Tue, Aug 22, 2017 at 1:42 AM, Akshat Kakkar > > wrote: > >> There are multiple hosts/clients. All are

Re: Something hitting my total number of connections to the server

On Tue, Aug 22, 2017 at 5:58 PM, Neal Cardwell wrote: > On Tue, Aug 22, 2017 at 1:42 AM, Akshat Kakkar wrote: >> There are multiple hosts/clients. All are mainly windows based. >> >> Timestamp is not used as my clients mainly are windows based and in

Re: Something hitting my total number of connections to the server

On Tue, 2017-08-22 at 10:46 -0700, David Ahern wrote: > On 8/22/17 10:44 AM, Eric Dumazet wrote: > > Willem wrote this doc in 2013, before we finally went back to 1000. > > > > We should update this doc. > > > And these too: > > $ egrep -r netdev_max_backlog Documentation/networking/ >

Re: Something hitting my total number of connections to the server

On 8/22/17 10:44 AM, Eric Dumazet wrote: > Willem wrote this doc in 2013, before we finally went back to 1000. > > We should update this doc. And these too: $ egrep -r netdev_max_backlog Documentation/networking/ Documentation/networking//cxgb.txt: sysctl -w

Re: Something hitting my total number of connections to the server

On Tue, 2017-08-22 at 09:43 -0700, David Ahern wrote: > On 8/22/17 6:02 AM, Eric Dumazet wrote: > >> > >> net.core.netdev_max_backlog=1 > > This is an insane backlog. > > > > https://www.kernel.org/doc/Documentation/networking/scaling.txt > > "== Suggested Configuration > > Flow limit is

Re: Something hitting my total number of connections to the server

On 8/22/17 6:02 AM, Eric Dumazet wrote: >> >> net.core.netdev_max_backlog=1 > This is an insane backlog. > https://www.kernel.org/doc/Documentation/networking/scaling.txt "== Suggested Configuration Flow limit is useful on systems with many concurrent connections, where a single connection

Re: Something hitting my total number of connections to the server

On Tue, 2017-08-22 at 11:12 +0530, Akshat Kakkar wrote: > There are multiple hosts/clients. All are mainly windows based. > > Timestamp is not used as my clients mainly are windows based and in > that it tcp timestamp is by defauly disabled. > > sysctl is as follows: > > kernel.shmmax =

Re: Something hitting my total number of connections to the server

On Tue, Aug 22, 2017 at 1:42 AM, Akshat Kakkar wrote: > There are multiple hosts/clients. All are mainly windows based. > > Timestamp is not used as my clients mainly are windows based and in > that it tcp timestamp is by defauly disabled. ... > net.ipv4.tcp_tw_reuse=1 >

Re: Something hitting my total number of connections to the server

On Tue, Aug 22, 2017 at 11:12 AM, Akshat Kakkar wrote: > There are multiple hosts/clients. All are mainly windows based. > > Timestamp is not used as my clients mainly are windows based and in > that it tcp timestamp is by defauly disabled. > > sysctl is as follows: > >

Re: Something hitting my total number of connections to the server

There are multiple hosts/clients. All are mainly windows based. Timestamp is not used as my clients mainly are windows based and in that it tcp timestamp is by defauly disabled. sysctl is as follows: kernel.shmmax = 68719476736 kernel.shmall = 4294967296 kernel.pid_max=4194303

Re: Something hitting my total number of connections to the server

On Mon, 2017-08-21 at 10:44 -0700, Eric Dumazet wrote: > - Why is timewait not being used ? > s/timewait/timestamps/

Re: Something hitting my total number of connections to the server

On Mon, 2017-08-21 at 22:58 +0530, Akshat Kakkar wrote: > As mentioned in my initial description, the server is not sending > SYN-ACK. Thats what the main symptom. For completeness, its not > sending any RST also. > However, if I disable TCP timestamp ... the server starts giving SYN-ACK. > The

Re: Something hitting my total number of connections to the server

On Monday, August 21, 2017, Eric Dumazet wrote: > > On Mon, 2017-08-21 at 15:26 +0530, Akshat Kakkar wrote: > > On Mon, Aug 21, 2017 at 3:13 PM, David Laight > > wrote: > > > From: Akshat Kakkar > > >> Sent: 18 August 2017 10:14 > > >> On Thu,

Re: Something hitting my total number of connections to the server

On Mon, 2017-08-21 at 15:26 +0530, Akshat Kakkar wrote: > On Mon, Aug 21, 2017 at 3:13 PM, David Laight wrote: > > From: Akshat Kakkar > >> Sent: 18 August 2017 10:14 > >> On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet > >> wrote: > >> > On Thu,

Re: Something hitting my total number of connections to the server

On Mon, Aug 21, 2017 at 5:56 AM, Akshat Kakkar wrote: > > The issue is with tcp timestamp. When I am disabling it, things are > working fine but when I enable the issue re-occurs. However, I am not > seeing tcp timestamps on packet, even when it is enabled simply > because

Re: Something hitting my total number of connections to the server

On Mon, Aug 21, 2017 at 3:13 PM, David Laight wrote: > From: Akshat Kakkar >> Sent: 18 August 2017 10:14 >> On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet wrote: >> > On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote: >> > >> >> I upgraded to

RE: Something hitting my total number of connections to the server

From: Akshat Kakkar > Sent: 18 August 2017 10:14 > On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet wrote: > > On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote: > > > >> I upgraded to 4.4 but still experiencing same issue. > >> Please help. > > > > Still too old kernel,

Re: Something hitting my total number of connections to the server

On Fri, 2017-08-18 at 18:14 +0530, Akshat Kakkar wrote: > On Fri, Aug 18, 2017 at 5:36 PM, Eric Dumazet wrote: > > On Fri, 2017-08-18 at 14:44 +0530, Akshat Kakkar wrote: > >> On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet > >> wrote: > >> > On

Re: Something hitting my total number of connections to the server

On Fri, Aug 18, 2017 at 5:36 PM, Eric Dumazet wrote: > On Fri, 2017-08-18 at 14:44 +0530, Akshat Kakkar wrote: >> On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet wrote: >> > On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote: >> > >> >> I

Re: Something hitting my total number of connections to the server

On Fri, 2017-08-18 at 14:44 +0530, Akshat Kakkar wrote: > On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet wrote: > > On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote: > > > >> I upgraded to 4.4 but still experiencing same issue. > >> Please help. > > > > Still too old

Re: Something hitting my total number of connections to the server

On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet wrote: > On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote: > >> I upgraded to 4.4 but still experiencing same issue. >> Please help. > > Still too old kernel, shoot again ;) > > Sorry but that's the maximum I can try as

Re: Something hitting my total number of connections to the server

On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote: > I upgraded to 4.4 but still experiencing same issue. > Please help. Still too old kernel, shoot again ;)

Re: Something hitting my total number of connections to the server

On Wed, Aug 16, 2017 at 4:04 PM, Eric Dumazet wrote: > On Wed, 2017-08-16 at 10:18 +0530, Akshat Kakkar wrote: >> On Mon, Aug 14, 2017 at 2:37 PM, Akshat Kakkar wrote: >> > I have centos 7.3 (Kernel 3.10) running on a server with 128GB RAM and >> >

Re: Something hitting my total number of connections to the server

On Wed, 2017-08-16 at 10:18 +0530, Akshat Kakkar wrote: > On Mon, Aug 14, 2017 at 2:37 PM, Akshat Kakkar wrote: > > I have centos 7.3 (Kernel 3.10) running on a server with 128GB RAM and > > 2 x 10 Core Xeon Processor. > > I have hosted a webserver on it and enabled ssh for

Re: Something hitting my total number of connections to the server

On Mon, Aug 14, 2017 at 2:37 PM, Akshat Kakkar wrote: > I have centos 7.3 (Kernel 3.10) running on a server with 128GB RAM and > 2 x 10 Core Xeon Processor. > I have hosted a webserver on it and enabled ssh for remote maintenance. > Previously it was running on Centos 6.3.

Something hitting my total number of connections to the server

I have centos 7.3 (Kernel 3.10) running on a server with 128GB RAM and 2 x 10 Core Xeon Processor. I have hosted a webserver on it and enabled ssh for remote maintenance. Previously it was running on Centos 6.3. After upgrading to CentOS 7.3, occasionally (probably when number of hits are more on