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From a6ccb238939b25851474a279b20367fd24a0e816 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 7 Jul 2017 17:21:53 +0200
Subject:  hack: net: fq_codel: tune defaults for small devices

Assume that x86_64 devices always have a big memory and do not need this 
optimization compared to devices with only 32 MB or 64 MB RAM.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/sched/sch_fq_codel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -462,7 +462,11 @@ static int fq_codel_init(struct Qdisc *s
 
 	sch->limit = 10*1024;
 	q->flows_cnt = 1024;
+#ifdef CONFIG_X86_64
 	q->memory_limit = 32 << 20; /* 32 MBytes */
+#else
+	q->memory_limit = 4 << 20; /* 4 MBytes */
+#endif
 	q->drop_batch_size = 64;
 	q->quantum = psched_mtu(qdisc_dev(sch));
 	INIT_LIST_HEAD(&q->new_flows);
> * * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * */ #include <stdio.h> #include <stdlib.h> #include <stddef.h> #include <unistd.h> #include <fcntl.h> #include <sys/mman.h> #include <sys/stat.h> #include <string.h> #define SEARCH_SPACE (16 * 1024) #define CMDLINE_MAX 512 int main(int argc, char **argv) { int fd, found = 0, len, ret = -1; char *ptr, *p; if (argc != 3) { fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]); goto err1; } len = strlen(argv[2]); if (len + 9 > CMDLINE_MAX) { fprintf(stderr, "Command line string too long\n"); goto err1; } if (((fd = open(argv[1], O_RDWR)) < 0) || (ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) { fprintf(stderr, "Could not open kernel image"); goto err2; } for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) { if (memcmp(p, "CMDLINE:", 8) == 0) { found = 1; p += 8; break; } } if (!found) { fprintf(stderr, "Command line marker not found!\n"); goto err3; } memset(p, 0, CMDLINE_MAX - 8); strcpy(p, argv[2]); msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE); ret = 0; err3: munmap((void *) ptr, len); err2: if (fd > 0) close(fd); err1: return ret; }