http2: optimize server frame writes
Don't do async frame writes when the write is known to be small enough
to definitely fit in the write buffer and not cause a flush (which
might block). This avoids starting a new goroutine and doing a channel
send operation for many frame writes.
name old time/op new time/op delta
ServerGets-4 146µs ± 2% 144µs ± 1% -1.46% (p=0.000 n=14+14)
ServerPosts-4 162µs ± 1% 160µs ± 1% -1.15% (p=0.000 n=15+15)
Server_GetRequest-4 145µs ± 1% 143µs ± 0% -1.26% (p=0.000 n=15+15)
Server_PostRequest-4 160µs ± 1% 158µs ± 1% -1.32% (p=0.000 n=15+15)
The headers frame is the main last one which might show some benefit
if there's a cheap enough way to conservatively calculate its size.
Change-Id: I9be2ddbf04689340819d8701ea671fff378d9e79
Reviewed-on: https://go-review.googlesource.com/31495
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
3 files changed
