set cap to 128 instead of 300

hannahkm · hannahkm · commit 0af971e77efa · 2026-06-30T15:01:04.000-04:00
diff --git a/ddtrace/tracer/payload_v1.go b/ddtrace/tracer/payload_v1.go
@@ -247,7 +247,7 @@ func (p *payloadV1) push(t spanList) (stats payloadStats, err error) {
 		// Pre-size buffer based on estimated span encoding size.
 		// 300 is an arbitrary guess for the average span encoding size -- we should measure and update this value
 		if cap(p.buf) == 0 {
-			p.buf = make([]byte, 0, len(t)*300)
+			p.buf = make([]byte, 0, len(t)*128)
 		}
 		p.buf = encodeStringField(p.buf, p.bm, 2, p.containerID, p.st)
 		p.buf = encodeStringField(p.buf, p.bm, 3, p.languageName, p.st)

Original file line number	Diff line number	Diff line change
`@@ -247,7 +247,7 @@ func (p *payloadV1) push(t spanList) (stats payloadStats, err error) {`
`247`	`247`	`// Pre-size buffer based on estimated span encoding size.`
`248`	`248`	`// 300 is an arbitrary guess for the average span encoding size -- we should measure and update this value`
`249`	`249`	`if cap(p.buf) == 0 {`
`250`		`- p.buf = make([]byte, 0, len(t)*300)`
	`250`	`+ p.buf = make([]byte, 0, len(t)*128)`
`251`	`251`	`}`
`252`	`252`	`p.buf = encodeStringField(p.buf, p.bm, 2, p.containerID, p.st)`
`253`	`253`	`p.buf = encodeStringField(p.buf, p.bm, 3, p.languageName, p.st)`