From e53a086b77a2c5bbe8818df80ab252498f94f85a Mon Sep 17 00:00:00 2001
From: Evgenii Baidakov <evgenii@nspcc.io>
Date: Tue, 3 Sep 2024 15:22:55 +0400
Subject: [PATCH] layer: Use smaller buffer for small payload

Closes #938.

Signed-off-by: Evgenii Baidakov <evgenii@nspcc.io>
---
 api/layer/multipart_upload.go | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/api/layer/multipart_upload.go b/api/layer/multipart_upload.go
index c4213864..eb2b40b8 100644
--- a/api/layer/multipart_upload.go
+++ b/api/layer/multipart_upload.go
@@ -312,7 +312,19 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 		},
 	}
 
-	chunk := n.buffers.Get().(*[]byte)
+	var (
+		chunk          *[]byte
+		isReturnToPool bool
+	)
+
+	if p.Size > n.neoFS.MaxObjectSize() {
+		chunk = n.buffers.Get().(*[]byte)
+		isReturnToPool = true
+	} else {
+		smallChunk := make([]byte, p.Size)
+		chunk = &smallChunk
+	}
+
 	var totalBytes int
 	// slice part manually. Simultaneously considering the part is a single object for user.
 	for {
@@ -350,7 +362,10 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 
 		break
 	}
-	n.buffers.Put(chunk)
+
+	if isReturnToPool {
+		n.buffers.Put(chunk)
+	}
 
 	reqInfo := api.GetReqInfo(ctx)
 	n.log.Debug("upload part",