[nsp] High latency

[Haesu]

Do you use VIP's (most likely yes) with enough RAM in them?
If so, make sure distributed-CEF is enabled on, as it will
reduce the load on the RSP quite a bit with ip input

-hc

-- 
Haesu C.
TowardEX Technologies, Inc.
Consulting, colocation, web hosting, network design and implementation
http://www.towardex.com | haesu at towardex.com
Cell: (978)394-2867     | Office: (978)263-3399 Ext. 170
Fax: (978)263-0033      | POC: HAESU-ARIN

On Wed, Nov 12, 2003 at 01:20:07PM -0600, Kevin wrote:
> Yes I'm running BGP on the router with full routes, here's the output
> from "sh proc cpu hist"
> I am running CEF on the router also.
> 
> border1#show processes cpu history
> 
>      3344444888882222233333333332222222222333333333322222222222
>      0011111777775555500000111119999977777000007777766666666664
> 100
>  90         *****
>  80         *****
>  70         *****
>  60         *****
>  50         *****
>  40    **********                              *****
>  30  *********************************************************
>  20  **********************************************************
>  10  **********************************************************
>     0....5....1....1....2....2....3....3....4....4....5....5....
>               0    5    0    5    0    5    0    5    0    5
> 
>                CPU% per second (last 60 seconds)
> 
> 
>      9999999998888777785999877899987789998899999887899889999878
>      2232488961410343713091098769147741862036888736488233800094
> 100       ****           *     **      **   ****    **   *
>  90  *********          ***   ****    ***  ******   **  ****
>  80  *************   ** ***************************************
>  70  ****************** ***************************************
>  60  ****************** ***************************************
>  50  **************#*****###****#*****#*####*****#*######******
>  40  ****#******###############################################
>  30  ##########################################################
>  20  ##########################################################
>  10  ##########################################################
>     0....5....1....1....2....2....3....3....4....4....5....5....
>               0    5    0    5    0    5    0    5    0    5
> 
>                CPU% per minute (last 60 minutes)
>               * = maximum CPU%   # = average CPU%
> 
> It does look like bgp scanner is running at the inteveral,
> How do I reduce the IP Input load?
> 
> Kevin,
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Streiner, Justin
> Sent: Wednesday, November 12, 2003 12:54 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [nsp] High latency
> 
> 
> On Wed, 12 Nov 2003, Kevin wrote:
> 
> > I'm having a really strange Issue with my 7513,
> > It seems like the 7513 will make the latency on any link
> > Jump up to a peak of 100ms to 400ms for a few packets then settle down
> 
> > to below 1ms Then after a little while (30sec to 1min) it'll do the 
> > same thing, The cpu load when this happens is around 30%-40% (this 
> > load is constant during the day),
> > None of the interfaces are overloaded, it happens on all the
> interfaces.
> > Is there anything else I can do to diagnose the problem?
> > It's a 7513 with an RSP4 and 12.2(14)s3.
> 
> Are you running BGP on this router?  If so, during these times of high
> latency, does the "BGP Scanner" process tear up lots of CPU when you
> look at a "sho proc cpu"?
> 
> If you do a "sho proc cpu hist", do you see lots of regular spikes up to
> around 100%?
> 
> If so, I'll bet what you're seeing is the BGP Scanner process walking
> the RIB.  If your router is heavily loaded and/or you're taking multiple
> full feeds this process can eat up lots of CPU and produce the latency
> you're seeing.
> 
> Running CEF won't specifically cure this problem, but it can help reduce
> the amount of CPU your router spends on other tasks, particularly IP
> Input.
> 
> jms
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
> 
> 
> 
> 
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/