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authorDavid 'Digit' Turner <digit@android.com>2011-04-26 18:09:17 +0200
committerDavid 'Digit' Turner <digit@android.com>2011-04-28 16:41:50 +0200
commitd4d688e926097faba7fd3717d1c0d3f296bdb526 (patch)
treeb6e89c99abae42e5bcef26afaa2952b5a870895b /hw/goldfish_device.h
parenta65e41529e4e3900372d54859f8c559cf79d953c (diff)
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New goldfish_pipe virtual device.
This adds a new virtual hardware device named "goldfish_pipe" used to implement a very fast communication channel between the guest system and the emulator. IMPORTANT: This depends on a special kernel driver, see: https://review.source.android.com/#change,22496 Usage from the guest is simply the following: fd = open("/dev/qemu_pipe", O_RDWR); const char* pipename = "pipe:<name>"; ret = write(fd, pipename, strlen(pipename)+1); if (ret < 0) { /* could not connect to service named <name> */ } /* now you can read()/write()/close() as a normal * file descriptor to exchange data with the service. */ In addition, this implements the following pipe services in the emulator: tcp:<port> tcp:<hostname>:<port> unix:<path> opengles The 'tcp:' and 'unix:' services simply redirect to a TCP or Unix socket on the host with minimal The 'opengles' service simply connects to tcp:locahost:22468 for now. We may change this to be more configurable in the future, but that's the port number used by the current experimental OpenGL ES hardware emulation host libraries / programs. Benchmarking with a simple ping-pong program shows that the guest <-> emulator can achieve a roundtrip bandwidth of 192 MB/s (on a 2.7 Ghz Xeon PC). Using the tcp: service to talk to a ping-pong server listening on localhost reaches 102 MB/s on the same machine, using a Unix socket reaches 140 MB/s. By contrast, using standard sockets in the guest reaches only 3.8 MB/s on the same machine (and requires special privileges from the application anyway).
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