Commit: b28857eee628de9ee6bbae63d745727c5bc81988 - system-core (git)

system/core

Commit MetaInfo

• Revision: b28857eee628de9ee6bbae63d745727c5bc81988 (tree)
• Zeit: 2019-05-21 09:43:30
• Autor: Josh Gao <jmgao@goog...>
• Commiter: android-build-merger

Log Message

Merge "adbd: reduce queue depths." into qt-dev
am: 7eeed22871

Change-Id: I83c6590a8c3693200bb37a77edd8782fb77d414c

Ändern Zusammenfassung

• modified: adb/daemon/usb.cpp

Diff

--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -58,10 +58,12 @@ using android::base::StringPrintf;
 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) {