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replace io.Discard usage to fix some NUMA copy() latencies (#18394)

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replace io.Discard usage to fix NUMA copy() latencies

On NUMA systems copying from 8K buffer allocated via
io.Discard leads to large latency build-up for every

```
copy(new8kbuf, largebuf)
```

can in-cur upto 1ms worth of latencies on NUMA systems
due to memory sharding across NUMA nodes.
This commit is contained in:
Harshavardhana
2023-11-06 14:26:08 -08:00
committed by GitHub
parent 64bafe1dfe
commit 754f7a8a39
14 changed files with 78 additions and 57 deletions
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3
cmd/peer-rest-server.go
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@@ -33,6 +33,7 @@ import (
"github.com/minio/madmin-go/v3"
b "github.com/minio/minio/internal/bucket/bandwidth"
"github.com/minio/minio/internal/event"
xioutil "github.com/minio/minio/internal/ioutil"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/pubsub"
"github.com/minio/mux"
@@ -1423,7 +1424,7 @@ func (s *peerRESTServer) DevNull(w http.ResponseWriter, r *http.Request) {
connectTime := time.Now()
ctx := newContext(r, w, "DevNull")
for {
n, err := io.CopyN(io.Discard, r.Body, 128*humanize.KiByte)
n, err := io.CopyN(xioutil.Discard, r.Body, 128*humanize.KiByte)
atomic.AddUint64(&globalNetPerfRX.RX, uint64(n))
if err != nil && err != io.EOF {
// If there is a disconnection before globalNetPerfMinDuration (we give a margin of error of 1 sec)