redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

drbd: don't recvmsg with zero length 

This should fix a performance degradation we observed recently.

If we don't expect any subheader, we should not call into the tcp stack,
as that may add considerable latency if there is no data available at
this point.

For a synthetic synchronous write load with single outstanding writes,
this additional latency when processing the "unplug remote" packet
added up to a performance degradation factor >= 10.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
hifive-unleashed-5.1
Lars Ellenberg 2010-10-29 23:32:01 +02:00 committed by Jens Axboe
parent 19650e8580
commit c13f7e1a94
1 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/block/drbd/drbd_receiver.c
View File

@ -3627,17 +3627,19 @@ static void drbdd(struct drbd_conf *mdev)
}
shs = drbd_cmd_handler[cmd].pkt_size - sizeof(union p_header);
rv = drbd_recv(mdev, &header->h80.payload, shs);
if (unlikely(rv != shs)) {
dev_err(DEV, "short read while reading sub header: rv=%d\n", rv);
goto err_out;
}
if (packet_size - shs > 0 && !drbd_cmd_handler[cmd].expect_payload) {
dev_err(DEV, "No payload expected %s l:%d\n", cmdname(cmd), packet_size);
goto err_out;
}
if (shs) {
rv = drbd_recv(mdev, &header->h80.payload, shs);
if (unlikely(rv != shs)) {
dev_err(DEV, "short read while reading sub header: rv=%d\n", rv);
goto err_out;
}
}
rv = drbd_cmd_handler[cmd].function(mdev, cmd, packet_size - shs);
if (unlikely(!rv)) {