Re: major performance drop on raid5 due to context switches caused by small max_hw_sectors [partially resolved]
From: Justin Piszcz <hidden>
Date: 2007-04-22 20:35:51
On Sun, 22 Apr 2007, Mr. James W. Laferriere wrote:
Hello Justin , On Sun, 22 Apr 2007, Justin Piszcz wrote:quoted
On Sun, 22 Apr 2007, Pallai Roland wrote:quoted
On Sunday 22 April 2007 16:48:11 Justin Piszcz wrote:quoted
Have you also optimized your stripe cache for writes?Not yet. Is it worth it? -- dYes, it is-- well, if write speed is important to you that is? Each of these write tests are averaged over three runs: 128k_stripe: 69.2MB/s 256k_stripe: 105.3MB/s 512k_stripe: 142.0MB/s 1024k_stripe: 144.6MB/s 2048k_stripe: 208.3MB/s 4096k_stripe: 223.6MB/s 8192k_stripe: 226.0MB/s 16384k_stripe: 215.0MB/s What is your /sys/block/md[0-9]/md/stripe_cache_size?On which filesystem type ? ie: ext3,xfs,rieser?,... Tia , JimL -- +-----------------------------------------------------------------+ | James W. Laferriere | System Techniques | Give me VMS | | Network Engineer | 663 Beaumont Blvd | Give me Linux | | babydr@baby-dragons.com | Pacifica, CA. 94044 | only on AXP | +-----------------------------------------------------------------+ - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
XFS