[
https://issues.apache.org/jira/browse/TS-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15312914#comment-15312914
]
ASF GitHub Bot commented on TS-4324:
------------------------------------
Github user masaori335 commented on the issue:
https://github.com/apache/trafficserver/pull/693
## before
```
$ nghttp --no-dep -vn
"https://127.0.0.1:4443/stream-bytes/163840?chunk_size=16284";
...
[ 0.130] recv DATA frame <length=7946, flags=0x00, stream_id=1>
[ 0.130] recv DATA frame <length=8438, flags=0x00, stream_id=1>
[ 0.169] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.169] recv DATA frame <length=9, flags=0x00, stream_id=1>
[ 0.206] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.206] recv DATA frame <length=9, flags=0x00, stream_id=1>
[ 0.242] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.242] recv DATA frame <length=9, flags=0x00, stream_id=1>
[ 0.279] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.279] recv DATA frame <length=9, flags=0x00, stream_id=1>
[ 0.316] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.316] recv DATA frame <length=9, flags=0x00, stream_id=1>
[ 0.325] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.325] recv DATA frame <length=0, flags=0x01, stream_id=1>
; END_STREAM
...
```
## after
```
$ nghttp --no-dep -vn
"https://127.0.0.1:4443/stream-bytes/163840?chunk_size=16284";
...
[ 0.135] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.168] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.205] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.241] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.277] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.288] recv DATA frame <length=16375, flags=0x00, stream_id=1>
[ 0.288] recv DATA frame <length=4150, flags=0x01, stream_id=1>
; END_STREAM
...
```
> Inefficient way of transferring data frames
> -------------------------------------------
>
> Key: TS-4324
> URL: https://issues.apache.org/jira/browse/TS-4324
> Project: Traffic Server
> Issue Type: Improvement
> Components: HTTP/2
> Reporter: Bryan Call
> Assignee: Masaori Koshiba
> Fix For: 7.0.0
>
>
> ATS transfers data 8K - 9 bytes (http/2 header size) and then sends the 9
> bytes is couldn't write in a new frame that only has 9 bytes. This also
> happens if you bump up the buffer size to 16K.
> {code}
> [ 1.036] recv DATA frame <length=8183, flags=0x00, stream_id=13>
> [ 1.036] recv DATA frame <length=9, flags=0x00, stream_id=13>
> [ 1.259] recv DATA frame <length=8183, flags=0x00, stream_id=13>
> [ 1.259] recv DATA frame <length=9, flags=0x00, stream_id=13>
> [ 1.259] recv DATA frame <length=8183, flags=0x00, stream_id=13>
> [ 1.259] recv DATA frame <length=9, flags=0x00, stream_id=13>
> {code}
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