Messages in this thread | | | Date | Fri, 17 Oct 2014 07:25:17 +0100 | From | Thomas Graf <> | Subject | Re: getaddrinfo slowdown in 3.17.1, due to getifaddrs |
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On 10/17/14 at 02:34am, Steinar H. Gunderson wrote: > On Fri, Oct 17, 2014 at 02:21:32AM +0200, Steinar H. Gunderson wrote: > > Hi, > > > > We recently upgraded a machine from 3.14.5 to 3.17.1, and a Perl script we're > > running to poll SNMP suddenly needed ten times as much time to complete. > > e341694e3eb57fcda9f1adc7bfea42fe080d8d7a looks like it might cause something > like this (it certainly added the synchronize_net() call). Cc-ing people on > that commit; quoting the entire rest of the message for reference.
I think the only option at this point is to re-add the nltable lock to netlink_lookup() so we can drop the synchronize_net() until we find a way to RCUify socket destruction. I will cook up a patch today unless somebody can come up with a smarter way to work around needing the synchronize_net().
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