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transfused: work-around virtio-9p/v9fs zero-copy bug

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Signed-off-by: David Sheets <david.sheets@docker.com>
This commit is contained in:
David Sheets 2016-03-20 11:00:16 +00:00
parent 3907ec30b1
commit 471833fae7
1 changed files with 7 additions and 2 deletions
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9
alpine/packages/transfused/transfused.c
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@ -23,6 +23,11 @@
#include "transfused_log.h" #include "transfused_log.h"
#define COPY_BUFSZ 65536 #define COPY_BUFSZ 65536
// The Linux 9p driver/xhyve virtio-9p device have bugs in the
// zero-copy code path which is triggered by I/O of more than 1024
// bytes. For an unknown reason, these defects are unusually prominent
// in the event channel use pattern.
#define EVENT_BUFSZ 1024
#define DEFAULT_FUSERMOUNT "/bin/fusermount" #define DEFAULT_FUSERMOUNT "/bin/fusermount"
#define DEFAULT_SOCKET9P_ROOT "/Transfuse" #define DEFAULT_SOCKET9P_ROOT "/Transfuse"
@ -530,10 +535,10 @@ void * event_thread(void * connection_ptr) {
if (read_fd == -1) if (read_fd == -1)
die(1, "couldn't open read path", "For connection %ld, ", connection->id); die(1, "couldn't open read path", "For connection %ld, ", connection->id);
buf = must_malloc("incoming event buffer", COPY_BUFSZ); buf = must_malloc("incoming event buffer", EVENT_BUFSZ);
while(1) { while(1) {
read_count = read(read_fd, buf, COPY_BUFSZ); read_count = read(read_fd, buf, EVENT_BUFSZ);
if (read_count == -1) die(1, "event thread: error reading", ""); if (read_count == -1) die(1, "event thread: error reading", "");
event_len = (int) ntohs(*((uint16_t *) buf)); event_len = (int) ntohs(*((uint16_t *) buf));