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From: "fche at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug debuginfod/27701] New: use long lived debuginfod-client objects
 & curl handles
Date: Tue, 06 Apr 2021 17:41:50 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27701

            Bug ID: 27701
           Summary: use long lived debuginfod-client objects & curl
                    handles
           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 inefficien=
cy
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 cac=
hed
information such as an active keep-alive http connection, or crypto session
keys, are thrown away.  Each new connection can take time & CPU, bleeding
latency.

If we retain the curl-easy handles across debuginfod-client calls, rather t=
han
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 ev=
en
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.

--=20
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