Control: tag -1 moreinfo On Wed, 13 Aug 2025 20:11:36 -0700 Josh Triplett <[email protected]> wrote: > Package: linux-sysctl-defaults > Version: 4.14 > Severity: wishlist > File: /usr/lib/sysctl.d/50-default.conf > X-Debbugs-Cc: [email protected] > > Current uses of QUIC benefit from higher buffer size limits. Please > consider setting: > > net.core.rmem_max = 7500000
I can see that it makes sense to increase this to allow increasing the receive window if the QUIC implementation sets its receive window based on this, or otherwise to reduce the risk of packets being dropped if user-space is slow to handle them. I would like to see a detailed justification for the specific value, though. > net.core.wmem_max = 7500000 This seems wrong. With QUIC the memory for replaying lost packets is allocated in user-space, so I don't see any need to increase buffering on the send side. I think that this would mostly contribute to bufferbloat. > See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes No justification is given there for increasing wmem_max. Ben. -- Ben Hutchings Time is nature's way of making sure that everything doesn't happen at once.
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