From: Anton Ivanov <antiv...@cisco.com>
socketpair() is a better IPC choice for lots of small requests
as it allows deeper (and configurable) queues than pipe()
As a result UBD will process nearly all of the requests submitted
to it instead of bouncing a significant percentage under load
Signed-off-by: Anton Ivanov <antiv...@cisco.com>
---
arch/um/drivers/ubd_kern.c | 2 +-
arch/um/drivers/ubd_user.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 66d424a..ae78211 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1268,7 +1268,7 @@ static bool submit_request(struct io_thread_req *io_req,
struct ubd *dev)
int n = os_write_file(thread_fd, &io_req,
sizeof(io_req));
if (n != sizeof(io_req)) {
- if (n != -EAGAIN)
+ if ((n != -EAGAIN) && (n != -ENOBUFS))
printk("write to io thread failed, "
"errno = %d\n", -n);
else if (list_empty(&dev->restart))
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
index e376f9b..117ff13 100644
--- a/arch/um/drivers/ubd_user.c
+++ b/arch/um/drivers/ubd_user.c
@@ -25,7 +25,7 @@ int start_io_thread(unsigned long sp, int *fd_out)
{
int pid, fds[2], err;
- err = os_pipe(fds, 1, 1);
+ err = socketpair(AF_UNIX, SOCK_STREAM, 0, (int *) &fds);
if(err < 0){
printk("start_io_thread - os_pipe failed, err = %d\n", -err);
goto out;
--
1.7.10.4
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