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-rw-r--r--src/core/lib/surface/call.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c
index 6c25952c0a..e3b088f663 100644
--- a/src/core/lib/surface/call.c
+++ b/src/core/lib/surface/call.c
@@ -1461,6 +1461,12 @@ static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx,
grpc_slice_buffer_stream_init(
&call->sending_stream,
&op->data.send_message->data.raw.slice_buffer, op->flags);
+ /* If the outgoing buffer is already compressed, mark it as so in the
+ flags. These will be picked up by the compression filter and further
+ (wasteful) attempts at compression skipped. */
+ if (op->data.send_message->data.raw.compression > GRPC_COMPRESS_NONE) {
+ call->sending_stream.base.flags |= GRPC_WRITE_INTERNAL_COMPRESS;
+ }
stream_op->send_message = &call->sending_stream.base;
break;
case GRPC_OP_SEND_CLOSE_FROM_CLIENT: