diff options
| author | Glenn Washburn <development@efficientek.com> | 2022-03-18 01:51:33 -0500 |
|---|---|---|
| committer | Daniel Kiper <daniel.kiper@oracle.com> | 2022-04-04 19:59:49 +0200 |
| commit | c2e5dc6916cbdd97d1c10f42fed2c4ba15c32736 (patch) | |
| tree | baff135425500155844b32fb45691bb5f65853a4 | |
| parent | 848724273e4c3bac7ff88b21a8abd764ada57b9c (diff) | |
| download | grub-c2e5dc6916cbdd97d1c10f42fed2c4ba15c32736.tar.gz | |
net/tcp: Only call grub_get_time_ms() when there are sockets to potentially retransmit for
If the machine has network cards found, but there are no tcp open sockets
(because the user doesn't use the network to boot), then grub_net_tcp_retransmit()
should be a noop. Thus GRUB doesn't need to call grub_get_time_ms(), which
does a call into firmware on powerpc-ieee1275, and probably other targets.
So only call grub_get_time_ms() if there are tcp sockets.
Aside from improving performance, its also useful to stay out of the firmware
as much as possible when debugging via QEMU because its a pain to get back
in to GRUB execution. grub_net_tcp_retransmit() can get called very frequently
via grub_net_poll_cards_idle() when GRUB is waiting for a keypress
(grub_getkey_noblock() calls grub_net_poll_cards_idle()). This can be annoying
when debugging an issue in GRUB on PowerPC in QEMU with GDB when GRUB is waiting
for a keypress because interrupting via GDB nearly always lands in the OpenBIOS
firmware's milliseconds call.
Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
| -rw-r--r-- | grub-core/net/tcp.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/grub-core/net/tcp.c b/grub-core/net/tcp.c index 200460121..93dee0caa 100644 --- a/grub-core/net/tcp.c +++ b/grub-core/net/tcp.c @@ -362,8 +362,13 @@ void grub_net_tcp_retransmit (void) { grub_net_tcp_socket_t sock; - grub_uint64_t ctime = grub_get_time_ms (); - grub_uint64_t limit_time = ctime - TCP_RETRANSMISSION_TIMEOUT; + grub_uint64_t ctime = 0, limit_time = 0; + + if (tcp_sockets != NULL) + { + ctime = grub_get_time_ms (); + limit_time = ctime - TCP_RETRANSMISSION_TIMEOUT; + } FOR_TCP_SOCKETS (sock) { |