diff --git a/README.md b/README.md
index f49f574..b9dddff 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ source .venv/bin/activate
 ## Topologies
 
 All topologies:
+  - `./topo/dc.yml` - A 3 node topology connected with a 1Gbit/s link and a 1ms latency
   - `./topo/with-vdsl.yml` - A topology mixing datacenters with fast internal connectivity and an isolated VDSL node
   - `./topo/50ms.yml` - An artifical topology simulating nodes with high bandwidth but with a fixed 50ms latency, useful to quantify the impact of latency on a distributed software
   - `./topo/multi-dc.yml` - Simulate 3 DC interconnected with 50ms latency WAN network and close to zero latency inside the DC
@@ -41,6 +42,7 @@ Feel free to write new topologies!
 
 All scenarios:
  - `./scenarios/garage-s3lat [garage-v0.7|garage-v0.8]` - Run s3lat on Garage
+ - `./scenarios/garage-concurrent [garage-v0.7|garage-v0.8]` - Run s3concurrent on Garage
  - `./scenarios/garage-warp [garage-v0.7|garage-v0.8] [default|fast]` - Run warp on Garage. 2 flavors are available: fast and default.
 
 *Scenarios take optional flavors as input that modulate their behavioir. Passing them is not mandatory,
diff --git a/benchmarks/s3concurrent/main.go b/benchmarks/s3concurrent/main.go
index 9f7f3af..55d7b3d 100644
--- a/benchmarks/s3concurrent/main.go
+++ b/benchmarks/s3concurrent/main.go
@@ -3,6 +3,8 @@ package main
 import (
 	"context"
 	"crypto/tls"
+	"fmt"
+	"time"
 	"io"
 	"log"
 	"math/rand"
@@ -99,24 +101,32 @@ func main() {
 	}
 	log.Printf("created bucket %s\n", buck)
 
+	fmt.Println("sent,success,elapsed,elapsed_per_req")
+
 	// Send to bucket
 	for i := 1; i <= 16; i++ {
 		log.Printf("start concurrent loop with %d coroutines\n", i)
 		syn := make(chan error)
+		
+		start := time.Now()
 		for j := 1; j <= i; j++ {
 			go func() {
 				syn <- putObj(buck, 1024*1024)
 			}()
 		}
 
+		errCount := 0
 		for j := 1; j <= i; j++ {
 			cerr := <-syn
 			if cerr != nil {
+				errCount += 1
 				log.Printf("%d/%d failed with %s\n", j, i, cerr)
 			}
 		}
+		elapsed := time.Since(start)
+		fmt.Printf("%d,%d,%v,%v\n", i, i - errCount, elapsed.Nanoseconds(), elapsed.Nanoseconds() / int64(i))
 		log.Printf("done, %d coroutines returned\n", i)
 	}
 
-	log.Println("done")
+	log.Println("bench done")
 }
diff --git a/scenarios/.garage-s3lat.swo b/scenarios/.garage-s3lat.swo
deleted file mode 100644
index ec47fd0..0000000
Binary files a/scenarios/.garage-s3lat.swo and /dev/null differ
diff --git a/topo/dc.yml b/topo/dc.yml
new file mode 100644
index 0000000..6017e97
--- /dev/null
+++ b/topo/dc.yml
@@ -0,0 +1,22 @@
+links:
+  - &1000
+    bandwidth: 1000M
+    latency: 1ms
+
+servers:
+  - name: node1
+    <<: *1000
+  - name: node2
+    <<: *1000
+  - name: node3
+    <<: *1000
+
+global:
+  subnet:
+    base: 'fc00:9a7a:9e::'
+    local: 64
+    zone: 16
+  latency-offset: 3ms
+  upstream:
+    ip: fc00:9a7a:9e:ffff:ffff:ffff:ffff:ffff
+    conn: *1000