Backport 6248: Fix response data slice too small (#6249)

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 See [RELEASE](./RELEASE.md) for workflow instructions.
 
+## Release v1.6.6-hotfix1
+
+### Improvements
+
+* [#6248](https://github.com/spacemeshos/go-spacemesh/pull/6248) Fixed node not being able to handle more than 6.55M
+  ATXs per epoch.
+
 ## Release v1.6.6
 
 ### Improvements

fetch/wire_types.go

@@ -121,7 +121,8 @@ type MaliciousIDs struct {
 
 type EpochData struct {
 	// When changing this value also check
-	// - the size of `ResponseMessage` above
+	// - the size of `ResponseMessage.Data` above
+	// - the size of `Response.Data` in `p2p/server/server.go`
 	// - the size of `NodeIDs` in `MaliciousIDs` above
 	// - the size of `Set` in `EpochActiveSet` in common/types/activation.go
 	// - the size of `EligibilityProofs` in the type `Ballot` in common/types/ballot.go

p2p/server/server.go

@@ -138,7 +138,7 @@ func (err *ServerError) Error() string {
 // Response is a server response.
 type Response struct {
 	// keep in line with limit of ResponseMessage.Data in `fetch/wire_types.go`
-	Data  []byte `scale:"max=209715200"` // 200 MiB > 6.0 mio ATX * 32 bytes per ID
+	Data  []byte `scale:"max=272629760"` // 260 MiB > 8.0 mio ATX * 32 bytes per ID
 	Error string `scale:"max=1024"`      // TODO(mafa): make error code instead of string
 }