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sk-queue: use write/read instread of sendfile

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sendfile uses sendpage() and all data are splitted on pages and
a new skb is allocated for each page. It creates a big overhead on SNDBUF.

sendfile() isn't suatable for DGRAM sockets, because message boundaries
should be saved.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2012-09-28 16:44:05 +04:00 committed by Pavel Emelyanov
parent 1ce1cca2ac
commit e149e12586
1 changed files with 26 additions and 2 deletions
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28
sk-queue.c
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@ -209,6 +209,7 @@ int restore_sk_queue(int fd, unsigned int peer_id)
list_for_each_entry_safe(pkt, tmp, &packets_list, list) {
SkPacketEntry *entry = pkt->entry;
char *buf;
if (entry->id_for != peer_id)
continue;
@ -216,9 +217,32 @@ int restore_sk_queue(int fd, unsigned int peer_id)
pr_info("\tRestoring %d-bytes skb for %u\n",
(unsigned int)entry->length, peer_id);
ret = sendfile(fd, img_fd, &pkt->img_off, entry->length);
/*
* Don't try to use sendfile here, because it use sendpage() and
* all data are splitted on pages and a new skb is allocated for
* each page. It creates a big overhead on SNDBUF.
* sendfile() isn't suatable for DGRAM sockets, because message
* boundaries messages should be saved.
*/
buf = xmalloc(entry->length);
if (buf ==NULL)
return -1;
if (lseek(img_fd, pkt->img_off, SEEK_SET) == -1) {
pr_perror("lseek() failed");
xfree(buf);
return -1;
}
if (read_img_buf(img_fd, buf, entry->length) != 1) {
xfree(buf);
return -1;
}
ret = write(fd, buf, entry->length);
xfree(buf);
if (ret < 0) {
pr_perror("Failed to sendfile packet");
pr_perror("Failed to send packet");
return -1;
}
if (ret != entry->length) {