diff options
Diffstat (limited to 'nbd')
| -rw-r--r-- | nbd/client-connection.c | 3 | ||||
| -rw-r--r-- | nbd/common.c | 26 | ||||
| -rw-r--r-- | nbd/nbd-internal.h | 5 | ||||
| -rw-r--r-- | nbd/server.c | 2 |
4 files changed, 36 insertions, 0 deletions
diff --git a/nbd/client-connection.c b/nbd/client-connection.c index b11e266807..79ea97e4cc 100644 --- a/nbd/client-connection.c +++ b/nbd/client-connection.c @@ -31,6 +31,8 @@ #include "qapi/clone-visitor.h" #include "qemu/coroutine.h" +#include "nbd/nbd-internal.h" + struct NBDClientConnection { /* Initialization constants, never change */ SocketAddress *saddr; /* address to connect to */ @@ -140,6 +142,7 @@ static int nbd_connect(QIOChannelSocket *sioc, SocketAddress *addr, return ret; } + nbd_set_socket_send_buffer(sioc); qio_channel_set_delay(QIO_CHANNEL(sioc), false); if (!info) { diff --git a/nbd/common.c b/nbd/common.c index 589a748cfe..2a133a66c3 100644 --- a/nbd/common.c +++ b/nbd/common.c @@ -18,6 +18,9 @@ #include "qemu/osdep.h" #include "trace.h" +#include "io/channel-socket.h" +#include "qapi/error.h" +#include "qemu/units.h" #include "nbd-internal.h" /* Discard length bytes from channel. Return -errno on failure and 0 on @@ -264,3 +267,26 @@ const char *nbd_mode_lookup(NBDMode mode) return "<unknown>"; } } + +/* + * Testing shows that 2m send buffer is optimal. Changing the receive buffer + * size has no effect on performance. + * On Linux we need to increase net.core.wmem_max to make this effective. + */ +#if defined(__APPLE__) || defined(__linux__) +#define UNIX_STREAM_SOCKET_SEND_BUFFER_SIZE (2 * MiB) +#endif + +void nbd_set_socket_send_buffer(QIOChannelSocket *sioc) +{ +#ifdef UNIX_STREAM_SOCKET_SEND_BUFFER_SIZE + if (sioc->localAddr.ss_family == AF_UNIX) { + size_t size = UNIX_STREAM_SOCKET_SEND_BUFFER_SIZE; + Error *errp = NULL; + + if (qio_channel_socket_set_send_buffer(sioc, size, &errp) < 0) { + warn_report_err(errp); + } + } +#endif /* UNIX_STREAM_SOCKET_SEND_BUFFER_SIZE */ +} diff --git a/nbd/nbd-internal.h b/nbd/nbd-internal.h index 715d92d6ef..6bafeef5dd 100644 --- a/nbd/nbd-internal.h +++ b/nbd/nbd-internal.h @@ -74,4 +74,9 @@ static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size, int nbd_drop(QIOChannel *ioc, size_t size, Error **errp); +/* nbd_set_socket_send_buffer + * Set the socket send buffer size for optimal performance. + */ +void nbd_set_socket_send_buffer(QIOChannelSocket *sioc); + #endif diff --git a/nbd/server.c b/nbd/server.c index 2076fb2666..d242be9811 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -3291,6 +3291,8 @@ void nbd_client_new(QIOChannelSocket *sioc, client->close_fn = close_fn; client->owner = owner; + nbd_set_socket_send_buffer(sioc); + co = qemu_coroutine_create(nbd_co_client_start, client); qemu_coroutine_enter(co); } |