Merge "adbd: reduce queue depths." am: 0fcd9292c4
am: 1c6d4f3663
Change-Id: I95bc10b35cf00f02833978d762c21be4b8e9b5e2
diff --git a/adb/daemon/usb.cpp b/adb/daemon/usb.cpp
index 3b29ab5..1e37015 100644
--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -58,10 +58,12 @@
static std::optional<bool> gFfsAioSupported;
// Not all USB controllers support operations larger than 16k, so don't go above that.
-static constexpr size_t kUsbReadQueueDepth = 32;
+// Also, each submitted operation does an allocation in the kernel of that size, so we want to
+// minimize our queue depth while still maintaining a deep enough queue to keep the USB stack fed.
+static constexpr size_t kUsbReadQueueDepth = 8;
static constexpr size_t kUsbReadSize = 4 * PAGE_SIZE;
-static constexpr size_t kUsbWriteQueueDepth = 32;
+static constexpr size_t kUsbWriteQueueDepth = 8;
static constexpr size_t kUsbWriteSize = 4 * PAGE_SIZE;
static const char* to_string(enum usb_functionfs_event_type type) {