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tailscale/util
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Mike O'Driscoll 1403920367
derp,types,util: use bufio Peek+Discard for allocation-free fast reads (#19067) 
Replace byte-at-a-time ReadByte loops with Peek+Discard in the DERP
read path. Peek returns a slice into bufio's internal buffer without
allocating, and Discard advances the read pointer without copying.

Introduce util/bufiox with a BufferedReader interface and ReadFull
helper that uses Peek+copy+Discard as an allocation-free alternative
to io.ReadFull.

  - derp.ReadFrameHeader: replace 5× ReadByte with Peek(5)+Discard(5),
    reading the frame type and length directly from the peeked slice.
    Remove now-unused readUint32 helper.

    name                  old ns/op  new ns/op  speedup
    ReadFrameHeader-8     24.2       12.4       ~2x
    (0 allocs/op in both)

  - key.NodePublic.ReadRawWithoutAllocating: replace 32× ReadByte with
    bufiox.ReadFull. Addresses the "Dear future" comment about switching
    away from byte-at-a-time reads once a non-escaping alternative exists.

    name                              old ns/op  new ns/op  speedup
    NodeReadRawWithoutAllocating-8    140        43.6       ~3.2x
    (0 allocs/op in both)

  - derpserver.handleFramePing: replace io.ReadFull with bufiox.ReadFull.

Updates tailscale/corp#38509

Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>
2026-03-24 10:52:20 -04:00
..
backoff all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
bufiox derp,types,util: use bufio Peek+Discard for allocation-free fast reads (#19067) 2026-03-24 10:52:20 -04:00
checkchange all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
cibuild all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
clientmetric all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
cloudenv all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
cloudinfo all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
cmpver all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
codegen all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
cstruct all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
ctxkey all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
deephash types/ptr: deprecate ptr.To, use Go 1.26 new 2026-03-05 20:13:18 -08:00
dirwalk all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
dnsname all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
eventbus all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
execqueue all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
expvarx all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
goroutines all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
groupmember all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
hashx all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
httphdr all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
httpm all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
limiter all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
lineiter all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
lineread all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
linuxfw util/linuxfw: fix nil pointer panic in connmark rules without IPv6 (#18946) 2026-03-10 15:19:15 -04:00
lru all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
mak all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
multierr all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
must all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
nocasemaps all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
osdiag util/osdiag: fix typo in comment (reciever -> receiver) 2026-03-23 12:54:38 +00:00
osshare all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
osuser util/osuser: extend id command fallback for group IDs to freebsd 2026-03-09 08:39:07 +00:00
pidowner all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
pool all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
precompress all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
progresstracking all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
prompt all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
qrcodes all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
quarantine all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
race all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
racebuild all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
rands all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
reload all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
ringlog all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
safediff all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
set all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
singleflight all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
slicesx all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
stringsx all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
syspolicy all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
sysresources all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
testenv all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
topk all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
truncate all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
usermetric all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
vizerror all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
winutil all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
zstdframe all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00