Bug 2670
| Summary: | extremely poor performance with SATA drive on 2.6 kernel. | ||
|---|---|---|---|
| Product: | IO/Storage | Reporter: | Gene Czarcinski (gczarcinski) |
| Component: | Serial ATA | Assignee: | Jeff Garzik (jgarzik) |
| Status: | CLOSED CODE_FIX | ||
| Severity: | normal | ||
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.5 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
I am now running Fedora Core 3 and the kernel 2.6.9-1.698_FC3. Everything now seems to run well. Performance on the SATA drive is now the same as on the ATA drive. |
Distribution: Fedora Core 1 with their kernel-2.4.22-1.2188 Fedora Core 2 with their kernel-2.6.5-1.356 Hardware Environment: ASUS SK8V motherboard with Opteron 140 on an onboard VIA adapter supporting a single SATA drive. There are two Maxtor 120GB drives on this system a PATA drive on /dev/hda and a SATA drive which is on /dev/hde on the 2.6 kernel and /dev/sda on the 2.4.22 kernel. The results of lspci are: 00:00.0 Host bridge: VIA Technologies, Inc. VT8385 [K8T800 AGP] Host Bridge (rev 01) 00:01.0 PCI bridge: VIA Technologies, Inc. VT8237 PCI bridge [K8T800 South] 00:0a.0 Ethernet controller: 3Com Corporation 3c940 10/100/1000Base-T [Marvell] (rev 12) 00:0c.0 Multimedia audio controller: Ensoniq 5880 AudioPCI (rev 02) 00:0f.0 RAID bus controller: VIA Technologies, Inc. VIA VT6420 SATA RAID Controller (rev 80) 00:0f.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) 00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 81) 00:10.4 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 86) 00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge [K8T800 South] 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R200 QM [Radeon 9100] (rev 80) Software Environment: Problem Description: When I run hdparm -Tt on the FC1 system with the 2.4 kernel, I get: /dev/hda: Timing buffer-cache reads: 2508 MB in 2.00 seconds = 1254.00 MB/sec Timing buffered disk reads: 170 MB in 3.03 seconds = 56.11 MB/sec /dev/sda: Timing buffer-cache reads: 2400 MB in 2.00 seconds = 1200.00 MB/sec Timing buffered disk reads: 168 MB in 3.01 seconds = 55.81 MB/sec or that the two disks operate pretty much the same. However, when I run hdparm -Tt on the FC2 system with the 2.6 kernel I get: [root@hummer root]# hdparm -Tt /dev/hda /dev/hda: Timing buffer-cache reads: 2364 MB in 2.00 seconds = 1181.59 MB/sec Timing buffered disk reads: 168 MB in 3.00 seconds = 55.93 MB/sec [root@hummer root]# hdparm -Tt /dev/hde /dev/hde: Timing buffer-cache reads: 2444 MB in 2.00 seconds = 1220.35 MB/sec Timing buffered disk reads: 12 MB in 3.40 seconds = 3.53 MB/sec