On 06/29/16 17:01, Bryan Drewery wrote: > On 6/29/2016 4:56 PM, Colin Percival wrote: >> Author: cperciva >> Date: Wed Jun 29 23:56:24 2016 >> New Revision: 302288 >> URL: https://svnweb.freebsd.org/changeset/base/302288 >> >> Log: >> Enable indirect segment I/Os by default in the Xen blkfront driver when >> running on EC2. Due to improvements in EC2, the performance penalty which >> was present on some EC2 instances no longer exists, and enabling this >> feature now consistently yields ~20% higher throughput with equal or lower >> latency. > > Does this rely on any driver updates / is it safe to make the same > change on my existing 10.2 system?
The relevant driver code is only in 10.3 and later. I'm not absolutely certain if already-running EC2 instances have the EC2 performance fix, either; you might need to launch a new instance in order to be guaranteed of the performance benefits. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"