From owner-freebsd-fs@FreeBSD.ORG Thu Oct 1 20:48:29 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 454D31065676 for ; Thu, 1 Oct 2009 20:48:29 +0000 (UTC) (envelope-from pepelac@gmail.com) Received: from mail-ew0-f209.google.com (mail-ew0-f209.google.com [209.85.219.209]) by mx1.freebsd.org (Postfix) with ESMTP id C417F8FC14 for ; Thu, 1 Oct 2009 20:48:28 +0000 (UTC) Received: by ewy5 with SMTP id 5so616445ewy.36 for ; Thu, 01 Oct 2009 13:48:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=YtIyF5Q+eFVDZhzsOzJ0fl2i+Y7kB8P0/fFfk3yZVmw=; b=xxF25U5Vx17MIO2IlU7q/Q3ccvmAr+rQpkwXV7Qzlk+B/XVhxaa5ZVydq827sXjl9m OAchD3csohUjihKiR9uzGzgD8MA+KJ9VOhWT4pZ56GplLylfvkUFJQZbL/M1eIWsN6uJ Gf99s6GFOa8lBbZLd9ludUE9p24zOeu9+LnG8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=mCWuyZS8nT1b/hUDbuc0rNkox65P5dp/Vx42mqai4dblEIAWUH0zd0Pnk9WDDdTeil Ysrnl1MIp6s62sT/tWHxhx8STp13RMbWhuA989bUTgxbJm0i9rS0ZIFyOF2/sjJbHZ4i wmHah3Po/EMbZ6uBhqQCP3ze/Za0p2/wq6LR0= MIME-Version: 1.0 Received: by 10.211.143.9 with SMTP id v9mr1935096ebn.53.1254428547896; Thu, 01 Oct 2009 13:22:27 -0700 (PDT) Date: Fri, 2 Oct 2009 00:22:27 +0400 Message-ID: <8c9ae7950910011322j1a6b66fcp73615cc17ae20328@mail.gmail.com> From: Alexander Shevchenko To: freebsd-fs@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: ARC & L2ARC efficiency X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Oct 2009 20:48:29 -0000 Good time of day! How could i check the efficiency of ARC? Are total reads from pool equal kstat.zfs.misc.arcstats.hits + kstat.zfs.misc.arcstats.misses, or this values are just reads from cache? By efficiency i mean reads_from_cache/(reads_from_cache+reads_from_drives) Are there any document where kstat values described? zpool status pool: data state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM data ONLINE 0 0 0 da2 ONLINE 0 0 0 da4 ONLINE 0 0 0 cache da3 ONLINE 0 0 0 #sysctl kstat kstat.zfs.misc.arcstats.hits: 282927703 kstat.zfs.misc.arcstats.misses: 66220328 kstat.zfs.misc.arcstats.demand_data_hits: 164374119 kstat.zfs.misc.arcstats.demand_data_misses: 6615511 kstat.zfs.misc.arcstats.demand_metadata_hits: 88715021 kstat.zfs.misc.arcstats.demand_metadata_misses: 4464890 kstat.zfs.misc.arcstats.prefetch_data_hits: 28851210 kstat.zfs.misc.arcstats.prefetch_data_misses: 55109950 kstat.zfs.misc.arcstats.prefetch_metadata_hits: 987353 kstat.zfs.misc.arcstats.prefetch_metadata_misses: 29977 kstat.zfs.misc.arcstats.mru_hits: 44560461 kstat.zfs.misc.arcstats.mru_ghost_hits: 1493532 kstat.zfs.misc.arcstats.mfu_hits: 211027800 kstat.zfs.misc.arcstats.mfu_ghost_hits: 16337660 kstat.zfs.misc.arcstats.deleted: 49112923 kstat.zfs.misc.arcstats.recycle_miss: 9574100 kstat.zfs.misc.arcstats.mutex_miss: 252423 kstat.zfs.misc.arcstats.evict_skip: 2269320648 kstat.zfs.misc.arcstats.hash_elements: 644877 kstat.zfs.misc.arcstats.hash_elements_max: 678888 kstat.zfs.misc.arcstats.hash_collisions: 21697862 kstat.zfs.misc.arcstats.hash_chains: 182323 kstat.zfs.misc.arcstats.hash_chain_max: 9 kstat.zfs.misc.arcstats.p: 1251375616 kstat.zfs.misc.arcstats.c: 1252817408 kstat.zfs.misc.arcstats.c_min: 1252817408 kstat.zfs.misc.arcstats.c_max: 10022539264 kstat.zfs.misc.arcstats.size: 1237578176 kstat.zfs.misc.arcstats.hdr_size: 9610640 kstat.zfs.misc.arcstats.l2_hits: 12905801 kstat.zfs.misc.arcstats.l2_misses: 680 kstat.zfs.misc.arcstats.l2_feeds: 52666 kstat.zfs.misc.arcstats.l2_rw_clash: 680 kstat.zfs.misc.arcstats.l2_writes_sent: 41330 kstat.zfs.misc.arcstats.l2_writes_done: 41330 kstat.zfs.misc.arcstats.l2_writes_error: 0 kstat.zfs.misc.arcstats.l2_writes_hdr_miss: 62 kstat.zfs.misc.arcstats.l2_evict_lock_retry: 53 kstat.zfs.misc.arcstats.l2_evict_reading: 5 kstat.zfs.misc.arcstats.l2_free_on_write: 30044 kstat.zfs.misc.arcstats.l2_abort_lowmem: 309837 kstat.zfs.misc.arcstats.l2_cksum_bad: 0 kstat.zfs.misc.arcstats.l2_io_error: 0 kstat.zfs.misc.arcstats.l2_size: 79319831552 kstat.zfs.misc.arcstats.l2_hdr_size: 134102528 kstat.zfs.misc.arcstats.memory_throttle_count: 112340 kstat.zfs.misc.vdev_cache_stats.delegations: 3822 kstat.zfs.misc.vdev_cache_stats.hits: 342974 kstat.zfs.misc.vdev_cache_stats.misses: 170601 WBR, Alexander Shevchenko