[Bug debuginfod/27701] New: use long lived debuginfod-client objects & curl handles

fche at redhat dot com sourceware-bugzilla@sourceware.org
Tue Apr 6 17:41:50 GMT 2021


            Bug ID: 27701
           Summary: use long lived debuginfod-client objects & curl
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: debuginfod
          Assignee: unassigned at sourceware dot org
          Reporter: fche at redhat dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Discussion of bug #27673 brought light to an important source of inefficiency
in the debuginfod protocol for applications that make repeated queries.  The
basic problem is that each time we nuke and recreate a curl handle, any cached
information such as an active keep-alive http connection, or crypto session
keys, are thrown away.  Each new connection can take time & CPU, bleeding

If we retain the curl-easy handles across debuginfod-client calls, rather than
creating/destroying them during Every Call, then much of that setup work is
eliminated, and anti-DoS web firewall concerns also eased.  Some estimates here
indicate savings of hundreds of milliseconds per call are available, and even
more if DoS penalties are applied.

debuginfod would itself be a good client to use this tactic to maintain
persistent connections to its federation partners.

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