Re: [Scst-devel] Low performance of scst-srpt

[Иван И. <iwa...@ya...>]

<br /><br />20:16, 9 августа 2017 г., Bart Van Assche &lt;bar...@wd...&gt;:<br /><blockquote><p>On 08/09/17 10:09, Иван Иванов wrote:<br /></p><blockquote> &gt; 19:10, 9 августа 2017 г., "Иван Иванов" &lt;<a href="mailto:iwa...@ya...">iwa...@ya...</a>&gt;:<br /><br />     Hi! I stand with low performance of scst-srp, server vs LSI raid vs<br />     36 1tb sata-3 drives, 32ram, so i deploy 4 vms vmware-io-test and<br />     test in 4k_50read_100random template, while ram is empty, everything<br />     is fast, but when it fills, performance bad and result 5 times less<br />     than microsoft iscsi... i use vdisk_fileio nv_cache 1<br />     SLES12, MLNX OFED 2.4, SCST trunk 7212<br /><br /> Is it problem with my configuration or may be i have tune FS or Huge <br /> Pages or something else, i see that ram fulls and very slowly flushes to <br /> disk...<br /></blockquote><p><br />Hello Иван,<br /><br />If you have not yet tried this and if your configuration allows this <br />please try to switch from vdisk_fileio to vdisk_blockio. With <br />vdisk_fileio, especially when using nv_cache=1, the number of dirty <br />pages in the page cache can get very large, resulting in huge queue <br />depths and high I/O latency.<br /><br />Bart.<br /></p></blockquote><br />Ok, i can not use nv_cache, but i think vdisk_fileio have to be faster, than blockio. I will use this for vmware esxi clients. How can i boost as far as i can, some advices, if it is possible?