Linode同一机房的VPS ping的速度也有很大差别是什么原因呢？

最近二个月来，我在家里访问我的vps速度总是很糟，比如同一Fremont机房的二个vps:
别人的 dbanotes.net 平均220ms 无丢包
我的 btodo.com 平均400ms 丢25%包

难道要请求linode换位置？

--------------traceroute的结果------------------
[~]$ traceroute dbanotes.net
traceroute to dbanotes.net (74.207.252.114), 30 hops max, 40 byte packets
...
9 211.136.2.206 (211.136.2.206) 8.651 ms 8.723 ms 9.018 ms
10 * * *
11 * * 12.86.240.53 (12.86.240.53) 238.882 ms
12 * * cr1.la2ca.ip.att.net (12.122.128.50) 256.878 ms
13 cr1.la2ca.ip.att.net (12.123.30.110) 241.241 ms 242.341 ms *
14 la2ca02jt.ip.att.net (12.123.30.17) 239.262 ms 236.763 ms 235.366 ms
15 att-gw.la.gblx.net (192.205.34.134) 277.877 ms 281.846 ms 279.192 ms
16 * Hurrican-Electric-LLC.Port-channel100.ar3.SJC2.gblx.net (64.214.174.246) 272.308 ms 281.641 ms
17 10gigabitethernet1-1.core1.fmt1.he.net (72.52.92.109) 269.592 ms 271.660 ms *
18 gige-g1-1.core2.fmt1.he.net (72.52.92.246) 270.986 ms * 290.285 ms
19 li94-114.members.linode.com (74.207.252.114) 268.021 ms 254.723 ms 255.866 ms
[~]$ traceroute btodo.com
traceroute to btodo.com (74.207.241.195), 30 hops max, 40 byte packets
...
9 211.136.2.206 (211.136.2.206) 8.857 ms 9.382 ms 8.835 ms
10 * 211.136.5.226 (211.136.5.226) 385.358 ms 382.725 ms
11 * * 12.88.178.21 (12.88.178.21) 369.354 ms
12 * * *
13 * cr2.la2ca.ip.att.net (12.123.30.250) 372.659 ms *
14 la2ca02jt.ip.att.net (12.123.30.17) 371.961 ms * *
15 att-gw.la.gblx.net (192.205.34.134) 405.385 ms * 409.791 ms
16 * Hurrican-Electric-LLC.Port-channel100.ar3.SJC2.gblx.net (64.214.174.246) 399.174 ms 405.020 ms
17 10gigabitethernet1-1.core1.fmt1.he.net (72.52.92.109) 413.244 ms 397.913 ms 398.433 ms
18 gige-g1-1.core2.fmt1.he.net (72.52.92.246) 405.755 ms * 402.272 ms
19 mail.btodo.com (74.207.241.195) 402.357 ms * 397.534 ms