Messages in this thread | | | Date | Fri, 04 Nov 2005 09:50:34 +0100 | From | Roberto Nibali <> | Subject | Re: Linux 2.4.32-rc2 |
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Salut Willy,
>>I will send a proper signed-off and acked-by patch against rc2 after >>some more stress testing. So, please hold off releasing until then. I'm >>done testing this piece of code by tomorrow noon (GMT+1). > > OK, fine. I'll merge it into next -hf (probably within a few days). Please > insist loudly if you consider it important to fix quickly because it's a > real regression, as I don't want to have people wait for long if one hotfix > causes trouble.
It is absolutely needed. Without it, people will really experience a long term problem with hanging templates in IPVS, manifesting itself depending on time and hardware configuration. So I insist that you merge this patch _NOW_ :).
I'm checking another issue with an asymmetric reference counting which is not a bug per se (so far) but could serve you with a plate of unwelcome surprises in the long run as well. This, however is post-2.4.32 material because I need a couple of 1000s test runs to check all invariants and configurations.
> OK, if it was your only concern, then I can say that it compiles and > runs on x86.
Perfect, thanks.
>>You would need to test IPVS on a SMP box using persistent setup and 0 >>port feature and the expire_nodest_conn proc-fs entry set to 1. Hit the >>LB with 100Mbit/s traffic balancing it on 2-3 RS and reload the >>configuration using ipvsadm, _but_ without rmmod'ing the ip_vs_* kernel >>modules. Set the persistency timeout low (60 secs) and the >>timeout_finwait to 10*HZ. You need 2 clients which connect over a Linux >>router to a LVS_DR setup, one needs to be router through and the other >>should be NAT'd on the Linux router using a NAT pool to simulate 100's >>of clients. This way you have the slashdot-hype and the AOL proxy boost >>hitting your LB and generating loaded persistency templates which will >>then hit the code in question, wenn the internal timer expires. You need >>to grep for NONE in ipvsadm -L -n -c to get the template entries. You >>must stop the client connecting directly through the Linux router after >>you reloaded the LB setup and then you observe the persistent template >>created for this client until the timer expires. Then you start it again >>and with luck you should see the abberant behaviour of a missed >>__ip_vs_conn_put(cp) :). I am pretty sure you do not want to go through >>this setup. I have it here and I'm stress testing all possible >>combinations of this szenario. > > Of course this is not the easiest setup just to chase a bug down. But with > such an explanation, a good manual on IPVS, and a lot of spare time, it > could be done if it was the only solution. But I'm not willing to spend > so much time on this yet :-)
I understand. It took me one week to set this up. Reading the code alone only made me suspicious.
Have a nice day, Roberto Nibali, ratz -- ------------------------------------------------------------- addr://Kasinostrasse 30, CH-5001 Aarau tel://++41 62 823 9355 http://www.terreactive.com fax://++41 62 823 9356 ------------------------------------------------------------- terreActive AG Wir sichern Ihren Erfolg ------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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