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mirror: Reduce the mirror convergence window to 5 seonds, from 60

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Also remove some obsolete constants
This commit is contained in:
nick
2013-09-24 14:42:21 +01:00
parent 96e60a4a29
commit b177faacd6
2 changed files with 13 additions and 13 deletions
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14
src/mirror.c
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@@ -213,18 +213,6 @@ void mirror_destroy( struct mirror *mirror )
/** The mirror code will split NBD writes, making them this long as a maximum */
static const int mirror_longest_write = 8<<20;
/** If, during a mirror pass, we have sent this number of bytes or fewer, we
* go to freeze the I/O and finish it off. This is just a guess.
*/
static const unsigned int mirror_last_pass_after_bytes_written = 100<<20;
/** The largest number of full passes we'll do - the last one will always
* cause the I/O to freeze, however many bytes are left to copy.
*/
static const int mirror_maximum_passes = 7;
#define mirror_last_pass (mirror_maximum_passes - 1)
/* This must not be called if there's any chance of further I/O. Methods to
* ensure this include:
* - Ensure image size is 0
@@ -603,7 +591,7 @@ static void mirror_read_cb( struct ev_loop *loop, ev_io *w, int revents )
/* Regardless of time estimates, if there's no waiting transfer, we can
* */
if ( !ctrl->clients_closed && ( !next_xfer || server_mirror_eta( ctrl->serve ) < 60 ) ) {
if ( !ctrl->clients_closed && ( !next_xfer || server_mirror_eta( ctrl->serve ) < MS_CONVERGE_TIME_SECS ) ) {
info( "Closing clients to allow mirroring to converge" );
server_forbid_new_clients( ctrl->serve );
server_close_clients( ctrl->serve );

12
src/mirror.h
View File

@@ -18,6 +18,18 @@ enum mirror_state;
*/
#define MS_CONNECT_TIME_SECS 60
/* MS_MAX_DOWNTIME_SECS
* The length of time a migration must be estimated to have remaining for us to
* disconnect clients for convergence
*
* TODO: Make this configurable so refusing-to-converge clients can be manually
* fixed.
* TODO: Make this adaptive - 5 seconds is fine, as long as we can guarantee
* that all migrations will be able to converge in time. We'd add a new
* state between open and closed, where gradually-increasing latency is
* added to client requests to allow the mirror to be faster.
*/
#define MS_CONVERGE_TIME_SECS 5
/* MS_HELLO_TIME_SECS
* The length of time the sender will wait for the NBD hello message