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xen-ia64-devel
RE: [Xen-ia64-devel] [PATCH] shrink vtlb size
Indeed good improvement.
Anthony
-----Original Message-----
From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kouya Shimura
Sent: 2007年8月15日 15:13
To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-ia64-devel] [PATCH] shrink vtlb size
Hi,
I observed usage ratio of vtlb by using the attached
modification (test_vtlb.diff).
It's very low. vtlb includes at most 21 entries.
The attached patch shrinks the default vtlb size from 512KB to 16KB
to optimize memory. Also speedup ptc_e emulation.
To improve the hash function, frequency of collision never changed
and there is no performance degradation.
The following is a result:
xm dmesg | sort | uniq -c
=============================================================
w/o patch (vtlb:512KB)
Linux:
1 (XEN) thash_purge_all entries:6 collisions:0
4 (XEN) thash_purge_all entries:7 collisions:0
10 (XEN) thash_purge_all entries:8 collisions:0
9 (XEN) thash_purge_all entries:9 collisions:0
4 (XEN) thash_purge_all entries:10 collisions:0
1 (XEN) thash_purge_all entries:11 collisions:0
1 (XEN) thash_purge_all entries:17 collisions:0
1 (XEN) thash_purge_all entries:20 collisions:0
1 (XEN) thash_purge_all entries:20 collisions:3
Windows:
75 (XEN) thash_purge_all entries:1 collisions:0
228 (XEN) thash_purge_all entries:2 collisions:0
19 (XEN) thash_purge_all entries:3 collisions:0
18 (XEN) thash_purge_all entries:4 collisions:0
5 (XEN) thash_purge_all entries:5 collisions:0
4 (XEN) thash_purge_all entries:6 collisions:0
2 (XEN) thash_purge_all entries:7 collisions:0
9 (XEN) thash_purge_all entries:8 collisions:0
8 (XEN) thash_purge_all entries:9 collisions:0
4 (XEN) thash_purge_all entries:10 collisions:0
2 (XEN) thash_purge_all entries:13 collisions:0
1 (XEN) thash_purge_all entries:14 collisions:0
1 (XEN) thash_purge_all entries:16 collisions:0
1 (XEN) thash_purge_all entries:21 collisions:0
=============================================================
w patch (vtlb:16KB)
Linux:
4 (XEN) thash_purge_all entries:7 collisions:0
6 (XEN) thash_purge_all entries:8 collisions:0
3 (XEN) thash_purge_all entries:9 collisions:0
10 (XEN) thash_purge_all entries:10 collisions:0
1 (XEN) thash_purge_all entries:11 collisions:0
3 (XEN) thash_purge_all entries:11 collisions:1
2 (XEN) thash_purge_all entries:12 collisions:0
1 (XEN) thash_purge_all entries:17 collisions:1
1 (XEN) thash_purge_all entries:19 collisions:1
1 (XEN) thash_purge_all entries:21 collisions:0
Windows:
90 (XEN) thash_purge_all entries:1 collisions:0
230 (XEN) thash_purge_all entries:2 collisions:0
19 (XEN) thash_purge_all entries:3 collisions:0
9 (XEN) thash_purge_all entries:4 collisions:0
6 (XEN) thash_purge_all entries:6 collisions:0
2 (XEN) thash_purge_all entries:7 collisions:0
10 (XEN) thash_purge_all entries:8 collisions:0
7 (XEN) thash_purge_all entries:9 collisions:0
4 (XEN) thash_purge_all entries:10 collisions:0
2 (XEN) thash_purge_all entries:13 collisions:0
1 (XEN) thash_purge_all entries:15 collisions:0
1 (XEN) thash_purge_all entries:16 collisions:0
1 (XEN) thash_purge_all entries:21 collisions:0
Thanks,
Kouya
Singed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
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