http://bugzilla.kernel.org/show_bug.cgi?id=11898 ------- Comment #37 from vandrove@xxxxxxxxxx 2008-11-12 02:47 ------- Patch from #36 fixes hangs & crashes. Thanks. So only remaining problem (for me...) is that with default setup I'm now getting only 50% of throughput I was getting with 2.6.27 - I can get ~40% back by limiting disks to 8 requests (so 31 per SATA controller is not hit that frequently), at the cost of making random I/O much worse... Here are sequential write data (dd if=/dev/zero of=/xxx) - with default setting ~25MBps * 4, with restricting disks to 8 commands ~39MBps * 4. 2.6.27 gets ~47MBps * 4, and 2.6.27 with sata_sil24 patch to increase PCIe read length gets ~51MBps * 4 (which is present in current git tree tested here). Default setting: gwy:~# ./x.sh 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 110.417 s, 38.0 MB/s gwy:~# 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 155.827 s, 26.9 MB/s 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 206.971 s, 20.3 MB/s 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 206.301 s, 20.3 MB/s Only 8 requests per drive; there are 4 drives sharing one tag map with 31 entries: gwy:~# for a in /sys/block/*/queue/nr_requests; do echo 8 > $a; done gwy:~# ./x.sh 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 103.588 s, 40.5 MB/s gwy:~# 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 110.86 s, 37.8 MB/s 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 105.978 s, 39.6 MB/s 4000+0 records in 4000+0 records out 4194304000 bytes (4.2 GB) copied, 107.94 s, 38.9 MB/s -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
