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Add a SPD cache to speed up lookups.

Description

Add a SPD cache to speed up lookups.

When large SPDs are used, we face two problems:

  • too many CPU cycles are spent during the linear searches in the SPD for each packet
  • too much contention on multi socket systems, since we use a single shared lock.

Main changes:

  • added the sysctl tree 'net.key.spdcache' to control the SPD cache (disabled by default).
  • cache the sp indexes that are used to perform SP lookups.
  • use a range of dedicated mutexes to protect the cache lines.

Submitted by: Emeric Poupon <emeric.poupon@stormshield.eu>
Reviewed by: ae
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D15050

Details

Provenance
fabientAuthored on
Reviewer
ae
Differential Revision
D15050: Add a SPD cache to speed up lookups
Parents
rS334053: Use __SCCSID for SCCS IDs in libkvm sources.
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